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The T4021 is Darn Tough's midweight tactical boot sock, knit in Vermont from US-raised Merino wool and Berry Amendment compliant for military use. Dense terry loop cushioning runs under the foot, around the toes and up the calf, with elastic arch support and reinforced heel and toe for durability. It stands about 11 inches heel to cuff, so it tops an 8-inch combat boot without excess fabric. Rivals like Fox River and Smartwool offer similar tactical socks, but Darn Tough's unconditional lifetime guarantee and dense knit are what owners cite most.
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As an Amazon Associate, Deal.ai earns from qualifying purchases.
Lowest price we've seen: $29.95 on Nov 11 at Amazon. Tracked across 2 stores since Nov 11.
Owners rate the T4021 very highly, praising its durability, cushioning and fit in combat and work boots. Complaints are few and mostly about warmth and bulk in snug footwear.
| Sock Size | Men's US | Women's US | EU | UK |
|---|---|---|---|---|
| XS | 2.5 - 5 | 4.5 - 7 | 35 - 38 | 2.5 - 4.5 |
| S | 5.5 - 7.5 | 7.5 - 9.5 | 38 - 40 | 5 - 7 |
| M | 8 - 9.5 | 10 - 11.5 | 41 - 42 | 7.5 - 9 |
| L | 10 - 12 | 12 - 14 | 43 - 45 | 9.5 - 11.5 |
| XL | 12.5 - 14.5 | - | 46 - 49 | |
| XXL | 15 - 17 | 50 - 53 | 15 - 16 |
The T4021 is a midweight, boot-height tactical sock with cushioning. Dense terry loop cushioning surrounds the calf, the bottom of the foot, and the toes. The toe and heel are reinforced for durability.
The sock is knit from 62% Merino wool, 36% nylon, and 2% elastane. The Merino wool is raised, sourced, and produced in the USA, and the sock is Berry Amendment compliant. Elastic arch support gives a snug fit that is meant to prevent slipping, bunching, and blisters.
It averages 11 inches from heel to cuff and rises just to the top of a basic 8-inch military combat boot. It can be worn with military combat boots, tactical boots, and dress boots.
