- Product Details
- Shipping and Returns
- The BPZ Promise
- Why Bulletproof Zone?
The 221B Tactical Equinoxx K2 Dyna-Thermal is a triple-layer thermal base layer shirt built for serious cold-weather performance, rated for temperatures below 15°F (-9.45°C). Designed as a full-coverage complement to the popular Equinoxx Stage 3 Thermal, the K2 extends 360-degree thermal protection from just below the waist to just below the chin, making it a complete single-layer cold-weather solution for outdoor workers, law enforcement, and recreational users. It retains body heat, blocks wind, and resists rain — all without the bulk of a heavy jacket. Available in standard shirt sizing.
Who this is for
- Outdoor professionals: postal workers, construction crews, linemen, oil rig workers, and anyone else logging long hours in cold, wet, or windy conditions who needs full mobility on the job.
- Law enforcement and security personnel: officers who need a standalone cold-weather base layer for off-duty or recreational use, or who want 360-degree torso coverage that the Stage 3 (designed around body armor) does not provide.
- Cold-weather recreational users: hunters, hikers, skiers, motorcyclists, and anglers who want a single packable layer that performs in sub-freezing temperatures without restricting movement.
Thermal performance
The K2 carries a temperature rating of sub-15°F (-9.45°C), achieved through a heat-pressed, triple-layer fabric construction. The outer layer is a stretchy polyurethane fabric. The middle layer resists water and blocks wind. The inner layer is a soft grid-thermal fleece that sits directly against the skin.
The grid design of the inner fleece liner reduces fabric weight while increasing warmth and compressibility. The grid channel structure creates targeted touch points that absorb and diffuse moisture vapor for faster evaporation, improving both wicking efficiency and breathability. The result is a base layer that keeps you warm during low-activity cold exposure and vents adequately when your output increases.
Construction and fit
The K2 is soft, stretchy, and non-bulky. The mock neck design extends coverage just below the chin. Extended compression sleeve cuffs keep the sleeves seated under gloves or outerwear. An extended torso length keeps the shirt tucked during dynamic movement. The regular fit is form-close without being compressive, and the polyurethane outer layer gives the fabric a degree of stiffness that is functional rather than uncomfortable — it contributes to wind blocking and shape retention during wear.
For sizing, choose your standard shirt size. If you fall between sizes, size up for a more comfortable fit over other layers.
Specifications
- Temperature rating: Sub 15°F / -9.45°C
- Construction: Heat-pressed, triple-layer fabric
- Outer layer: Stretchy polyurethane fabric
- Middle layer: Wind-blocking, water-resistant membrane
- Inner layer: Soft grid-thermal fleece
- Neck: Mock neck, coverage to just below the chin
- Coverage: Full 360° from just below the waist to just below the chin
- Cuffs: Extended compression sleeve cuffs
- Torso: Extended length — stays tucked
- Fit: Regular
- Care: Machine wash cold; hang dry preferred or tumble dry low
Frequently asked questions
How does the K2 differ from the Equinoxx Stage 3 Thermal?
The Stage 3 is designed specifically as a body armor base layer, and its coverage accounts for the fact that body armor covers the mid-section. The K2 provides the same features but adds full 360-degree thermal protection from just below the waist to just below the chin — making it the better choice when you are not wearing a plate carrier or soft armor vest.
Can I wear this under body armor?
Yes. Officers and security personnel who already use the Stage 3 under their armor may find the K2 more useful as an off-duty cold-weather layer, since the full torso coverage it provides would be largely redundant under a vest. That said, the K2 will fit under most body armor carriers without adding significant bulk.
Will one layer be enough in extreme cold?
The K2 is rated for sub-15°F conditions as a standalone base layer. User experience in conditions ranging from -15°C to -20°C with only a light outer shell or hoodie on top confirms effective heat retention at those temperatures. In truly extreme wind and cold, pairing it with a shell jacket extends performance further while still eliminating the need for multiple inner layers.
How should I size this?
Choose your standard shirt size. Because the K2 is designed to be form-fitting, size up if you are between sizes — especially if you plan to wear a light layer on top. The extended cuffs and torso length are built into all sizes.
Can I machine wash this?
Yes. Machine wash cold. Hang dry is preferred; tumble dry on low is acceptable. Avoid high heat, which can degrade the polyurethane outer layer and the heat-pressed construction over time.
Is this only for law enforcement, or is it suitable for general outdoor use?
It works for anyone who spends time outdoors in cold weather. The product is well-suited for construction workers, delivery and postal workers, crossing guards, hunters, motorcyclists, skiers, and hikers. The 221B Tactical lineage in law enforcement gear means the construction skews toward durability and functional performance rather than casual streetwear aesthetics.
Bulletproof Zone will ship orders as soon as possible. For example, if you purchase three items, they will be shipped to you based on lead time and availability. This way you get as much of your order as soon as possible, which means that your order may come in separate packages, especially if you order products from different manufacturers.
We will bear the shipping cost for products returned because of product defect, misrepresentation, or false description. Afterward, we will initiate a full reimbursement should you decline an offer to replace the item with the same item of equal value and assured quality.
Order Confirmation:
As soon as you place your order with Bulletproof Zone, you will receive an order confirmation e-mail. This means that your order has been logged in our system and your credit card has been pre-authorized for the purchase. Afterward, we contact our suppliers to confirm the availability of the product you are ordering for immediate shipment. If your item is on backorder or unavailable, we will cancel the pre-authorization and duly inform you via e-mail.
Order Shipment:
Orders are shipped within five business days from the date of your order unless specified otherwise on the product page. The product page will contain the most accurate estimate on shipping and lead times. Shipping and lead times provided on the product page are our best estimates based various factors including order volume, information from our manufacturer, raw material fluctuations, etc., and may vary due to these factors.
You will receive an email containing the tracking information of your order after the order has been shipped to your location. If you do not receive tracking information from us within seven business days of the lead time specified on the product page, feel free to follow up with us at orders@bulletproofzone.com.
Bulletproof Zone is not responsible for lost or stolen packages. A tracking number will be provided when the package is shipped. It is the buyer’s responsibility to provide a safe place to receive mail. Once an item has been marked as delivered by the carrier, the seller is not responsible should that item go missing.
Some of our products are carried by manufacturers in various countries. Due to the nature and cost of the products that Bulletproof Zone sells, you may be charged additional import duties upon delivery. Our support team can help in investigating abnormally high import duty charges but we are unable to cover the cost of any import duties.
Damages:
We take full responsibility for any obvious damage to your product caused by wrong packaging or delivering an already defective product. Please inspect the packaging of your item(s) when they arrive, if you notice any damage, you should document it when signing for delivery. If the item(s) contained in the package arrives damaged, please send photos to support@bulletproofzone.com, and we will process an insurance claim on your behalf.
Returns and Cancellation Policy:
We back all our products with a customer satisfaction guarantee, so we created a fair return and cancellation policy.
All sales are final. No Refunds, No Cancellations. In most cases, once the order is processed, it is final and not cancellable. We may allow exceptions due to an order error or wish to return your order after delivery for any reason other than a product defect or misrepresentation. Any cancellation request is subject to an administration and cancellation fee equal to 10% of your order with a minimum of $35, whether order shipment is successful or not.
All sales are final on all closeout items and for custom manufactured bulletproof clothing once the manufacturing process has begun or not returnable unless there is a product defect or misrepresentation. Applicable to brands such as MC Armor, Israel Catalog, BulletBlocker, Tacticon Armament, Wonder Hoodie, and others.
Before returning any product, you MUST obtain a return authorization from our customer service representative. We can only process AUTHORIZED returns for items.
To make a Return or Exchange:
- Obtain authorization for return or exchange by emailing us at support@bulletproofzone.com explaining the reason for the return or exchange.
- Please use or indicate your order number as attention
Return or exchanges request submission must be within 14 calendar days upon receipt of shipment unless noted otherwise on the product description page. Your return must be in original packaging and unused.
We encourage using USPS flat-rate shipping in returning products to receive a shipping expense refund. Buyers must ensure all returned parcels delivery receipt AND signature confirmation. We highly recommend insuring your parcel as we cannot issue a refund for an item that we do not receive back should it get lost/damaged during transit.
Refunds:
Should an item be returned because it was defective, misrepresented, not as described, etc., Bulletproof Zone will issue a full refund and will reimburse the customer for all shipping expenses associated with the return.
Please allow 5-10 business days from the time the item is received to process a refund. Refunds will only be issued to the original credit card that you use when placing your order.
We stand behind our products 100%!
By purchasing any of our items, the buyer certifies they have read and agree to our shipping, return, and privacy policies.
The Bulletproof Zone Promise
When you buy body armor, you're buying your safety. We don't take that lightly. Here's what every order from Bulletproof Zone includes.
1. Authorized dealer of every brand we carry
Every plate, vest, and carrier we ship comes from the manufacturer directly to our warehouse. We don't sell gray-market product, surplus, or returns. That means factory-fresh stock, the full manufacturer warranty, and real after-sale support — the kind only an authorized dealer can offer.
We maintain authorized-dealer relationships with America's leading body armor brands, including Spartan Armor Systems, AR500 Armor, RMA Defense, Shellback Tactical, Caliber Armor, DFNDR Armor, Protection Group Denmark, BulletSafe, BulletBlocker, and over 40 more.
2. Best price, guaranteed
If you find a lower price at another authorized dealer of the same product within six months of your purchase, we'll refund the difference.
Why the "authorized dealer" requirement? Because gray-market and surplus armor may not be genuine, may have a compromised supply chain, and almost never comes with a manufacturer warranty. We won't price-match against products that may not actually protect you.
3. Free fitment consultation
Body armor only protects you if it fits. Email us a photo and your measurements before you order, and one of our specialists will help you size your carrier and plates correctly — at no charge, no obligation.
4. Trusted by thousands of customers
Bulletproof Zone has been a trusted authorized dealer of America's leading body armor manufacturers for over five years. We have over 4,000 verified Trustpilot reviews from real customers across all 50 states.
Price Match Guarantee — Terms
- You must have purchased the item from our website before requesting the price match.
- Discounted items and "free with purchase" items are not eligible.
- The item must be in stock on the competitor's website at the time of your request.
- The price match is valid for six months from the date of your purchase.
- The competitor must be an authorized dealer of the product. Auction sites (eBay, Overstock), discounters, and gray-market resellers do not qualify.
- The competitor must operate an online store. Brick-and-mortar-only retailers do not qualify.
- Price match applies to the item price plus shipping. Sales tax is excluded.
To request a price match, email us a link to the product on our site and the same product on the competitor's site within six months of purchase. We'll process the refund.
Why Bulletproof Zone?
At Bulletproof Zone, we are passionate about protecting lives. Every piece from our catalog is designed and rigorously tested to provide the highest quality of protection you need from firearms, explosives or even close quarters combat.
We’ve partnered with various manufacturers that operate within the United States under a strict set of guidelines both on a national and corporate level so that when you shop with us, you will be able to select from the highest quality body armor, ballistic plates and tactical gear available on the market.
Whether you are a military service member looking to find your own gear, a professional that operates in the security field, or an avid firearms enthusiast that capitalizes the importance of safety when shooting, our tactical gear will provide you the level of protection you need.
Any questions or concerns? Please call us at (408)-909-4938 or email us at support@bulletproofzone.com and a member of our professional support team will be in touch with you as soon as possible.
