These boots feature a flexible, yet shockproof synthetic shell and a shock-absorbing neoprene lining, which are both perforated. These perforations encourage the natural flow of air, as a result of which heat and moisture can be transported easily. In addition, the boots are equipped with the registered I.4U Heat Dispenser System in the form of aluminium collectors on the skin side. These small metal discs collect the heat of the leg and transport it to the outer of the boot. The lightweight boots have secure Velcro closures and can be put in the washing machine.