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Patented Cuff-seal Technology, Knee Length Outer: 96% Polyamide, 4% Elastane Interlining: Porelle® membrane Inner: 40% Merino wool, 40% Acrylic, 17% Polyamide, 3% Elastane User Tip: Please refer to the circumference of the stretchy cuff below: Small & Medium: 22cm Relaxed - 28cm Stretched Large & X-Large: 27cm Relaxed - 33cm Stretched The Wading Pro socks can effectively stop water from entering the waterproof socks at the top.