Improved! 50% more Stretch! The warmest sock ever. Four-way super stretch comfort. Breathable Macro-Porous technology for drier warmth. Seals in the heat. Neoprene WATERPROOF AND BREATHABLE - The Neosock offers a great combination of windproof, waterproof and breathability COMFORTABLE - 50% more stretch provides comfortable all day wear WARMEST SOCK EVER - Our Macro-porous technology seals in heat for maximum warmth DURABLE - Certified non-toxic neoprene - Outlasts ordinary socks 3 to 1!​​