Apparel & Accessories · Final Sale
WARMKNIT Long Underwear
Mackweldon · sold by Mack Weldon · $29.99–$54.99 · in stock
We reinvented long underwear with insulating Thermolite® technology and a micro-waffle texture for warmth without the weight. You'll find a form-fitting base layer that sits close to your skin without the stuffed feeling of traditional thermal underwear. Built for winter layering under any outfit, WARMKNIT delivers genuine warmth through advanced insulation rather than excess fabric, keeping you comfortable for months of cold weather.
| Option | Price | Stock | |
|---|---|---|---|
| True Navy / S | $29.99 | out of stock | |
| True Navy / M | $29.99 | out of stock | |
| True Navy / L | $29.99 | in stock | Buy at Mack Weldon → |
| True Navy / XL | $29.99 | in stock | Buy at Mack Weldon → |
| True Navy / XXL | $29.99 | in stock | Buy at Mack Weldon → |
| Charcoal Heather / S | $29.99 | out of stock | |
| Charcoal Heather / M | $29.99 | out of stock | |
| Charcoal Heather / L | $29.99 | out of stock | |
| Charcoal Heather / XL | $29.99 | in stock | Buy at Mack Weldon → |
| Charcoal Heather / XXL | $29.99 | in stock | Buy at Mack Weldon → |
| Dark Forest / S | $29.99 | out of stock | |
| Dark Forest / M | $29.99 | out of stock | |
| Dark Forest / L | $29.99 | out of stock | |
| Dark Forest / XL | $29.99 | out of stock | |
| Dark Forest / XXL | $29.99 | in stock | Buy at Mack Weldon → |
| True Black / S | $54.99 | out of stock | |
| True Black / M | $54.99 | out of stock | |
| True Black / L | $54.99 | out of stock | |
| True Black / XL | $54.99 | out of stock | |
| True Black / XXL | $54.99 | out of stock |
Prices and stock from mackweldon.com’s public catalog, last checked 2026-11-01 06:35 UTC; the store’s checkout shows the final price. Agents: JSON at https://api.kaupia.com/v1/product?id=kp:b4c7ec55-549a-4a44-a686-e8e19e63d82e; buy with POST /v1/checkout or MCP create_checkout.