BEYOND CLOTHING Beyond Clothing Level 7 PrimaLoft Sleeveless Vest Insulated Material: 100% Nylon Size: M This is a high-loft vest made by Beyond Clothing, officially adopted by the US military's special forces as their final cold-weather garment. It uses PrimaLoft (a polyester said to be about 8 times warmer than down) for its fill. It's a simple and highly functional item. There is some slight wear and minor soiling, but it can still be worn.