A good insole is very important for a comfortable boot use. Dunlop has two types of in-soles: a basic version (Dunlop Insole) and a version with added ergonomic support (Dunlop Premium Insole). The Premium version offers: Ergonomic support Ergonomically shaped foot bed improves comfort in the boot and reduces fatigue.Heel energy-absorption.Metatarsal support.Arch support.Air-ventilation channels to further improve breathability in the toe area. Wearing comfort Absorption: the new insoles are able to absorb 3 times their own weight.Breathability: the open structure of the material guarantees the best possible desorption/ventilation performance.Odour Control: 30% better than regular insoles.Energy absorption: improved shock absorption by 100%. Durability They will stay in shape on insertion and removal from the boot. Protection ESD/Anti-static certified.