The Grubs Rainline is better than ever before. It features a TRAX sole which makes for a better grip and provides excellent stability on the waterfront. They consist of a rubber foot (with the reinforcement at the level of the teentop, Achilles tendon, and tibia), a shaft in chloroprene and a jersey lining of 5.0 mm thick, which means that the boot is suitable for prolonged periods of time within the specified temperature range.