The Simms Fall Run Vest is the ideal 3 season insulated vest. Perfect for almost any fishing season of the year from the spring bass to the fall walleye. This vest is warm, but fits comfortably under your waders or bibs. With Primaloft insulation, this vest will keep you warm even when damp. Made for packing as it compresses down easily and fits perfectly in your gear bag. Primaloft Black Eco insulation 60g (body) uses 60% recycled materials, treated for water repellency.100% recycled shell with DWR finish Zippered handwarmer pockets and internal chest zippered pocket Internal quilting on upper front and back body provides smooth exterior for abrasion resistance if worn with waders or bibs. Fabric Tech: Shell - 1.71 oz./yd.2 (58gsm) 100% recycled polyester-ripstop with DWR; Insulation - Prima Loft Black Eco insulation, 40g (sleeves); Lining - 1.39 oz./yd.2 (47 gsm) 100% recycled polyester taffeta with DWR.