Simms' exclusive 5-layer Gore-Tex Pro fabric is found in the seat, waist, and throughout the leg for rugged durability and absolute protection, and there's 3-layer Gore-Tex Pro in the upper part for greater comfort and breathability. The G3 Guide is designed to easily convert to a waist-high wader for versatility in any fishing environment while articulated knees ensure maximum comfort and mobility as you reel in your catch.