The Vest-Port fabric is made from durable 100% polyester warp knitted fabric which is fully certified to the latest high visibility standard. The fabric is lightweight, comfortable and highly breathable. It can be worn over layers to ensure total visibility without adding bulk. EN ISO 20471 CLASS 2. Fabric: 100% Polyester. S/M, L/XL, XXL/3XL, 4XL/5XL (36/41”, 42/48”, 50/55”, 56/64”). Ref: UTRW4388