Helly Hansen's Softpile thermal combination suit features FibreLock® construction, which is a unique, patented w-weaver knitting technique whereby the fibres on the pile side (inside) are anchored, or locked, to the backing. This FibreLock® system provides excellent insulation with extreme durability. Softpile garments are very comfortable and long-lasting, and make an ideal middle layer. The Softpile combination suit features a 2-way front zipper, knit cuffs, flatlock seams, and zippered rear "trap door".