Fabric Type Neoprene: Waterproof (5.5mm) and WINTER PROTECTION (up to -8° F/-22°C) Shaft Height- 12.4 Inches Sturdy handles help you slip the boots on more easily. Adjusts to the contours of your foot to resist blisters and chafing. Lightweight Rubber Neoprene Boot, 5.5 mm neoprene provides comfort and flexibility, along with excellent waterproofing, shock absorption and heat retention properties.