The NRS Rodeo Sock was designed and tested with playboaters in mind. This resulted in the perfect combination of warmth and protection in a comfortable low profile sock. NRS Rodeo Sock Specifications: 3mm neoprene upper provides both insulation and cushioning.1.5mm vulcanized rubber sole protects your feet in and out of the boat.ToughTex fabric covers the entire foot area, making this one of the most durable low profile socks on the market.Elastic hook and loop ankle strap helps to keep excess water from seeping in and keeps them on your feet if you go in the water. Click here to read The CKS Product Review Blog for more information on this item