Product Features This product is made from synthetic rubber materials such as chloroprene (neoprene) and SBR, and is used in the following scenarios: Uses: Primarily used as inner socks for long boots and waders, it is ideal for fishing, working in water, and cold weather protection in the dead of winter. Functions: It has high waterproof, heat retention, and windproof properties, protecting your feet from cold and water ingress. Materials: Materials with excellent fit and elasticity are used, and types with fleece or similar lining inside provide even greater heat retention.