The Socks,extreme Cold Weather, cataloged under National Stock Number 8415-01-679-4983, is classified within Federal Supply Class 8415 (Clothing, Special Purpose) of the Clothing, Individual Equipment, and Insignia group. The manufacturer of record is Cabot Hosiery Mills, Inc Dba Darn Tough Vermont. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 8415-01-679-4983 |
| Primary Part Number | U4050-XS |
| Item Name | Socks,extreme Cold Weather |
| FSC / FSG | 8415 / 84 — Clothing, Special Purpose |
| Manufacturer | Cabot Hosiery Mills, Inc Dba Darn Tough Vermont |
| Status | ACTIVE |
| Size | X-SMALL |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| U4050-XS PRIMARY | Cabot Hosiery Mills, Inc Dba Darn Tough Vermont (USA) |
| FR20078-XS PRIMARY | Frm Socks Llc (USA) |
| 812-HOTC-XS PRIMARY | Black Canyon Concepts, Llc (USA) |
| Reference | Meaning |
|---|---|
| 14050 | 5/9 Secondary reference Cabot Hosiery Mills, Inc Dba Darn Tough Vermont |
NSN 8415-01-679-4983 is a Socks,extreme Cold Weather, manufactured by Cabot Hosiery Mills, Inc Dba Darn Tough Vermont, classified under FSC 8415, Clothing, Special Purpose. Status: active.
NSN 8415-01-679-4983 has 3 manufacturer part numbers on file: U4050-XS (Cabot Hosiery Mills, Inc Dba Darn Tough Vermont), FR20078-XS (Frm Socks Llc), 812-HOTC-XS (Black Canyon Concepts, Llc).
Key specifications for U4050-XS: Size: X-SMALL; Special Features: SOCKS,EXTREME COLD WEATHER/MOUNTAINEERING MERINO WOOL. 1 specification is documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.