ARMA OXI-ZONE Tendon Boot performance level ARMA OXI-ZONE tendon boots offer next-generation protection with excellent temperature regulating features with 360° VENTILATION: Directional venting of the outer shell and open structure fabrics keep air circulating all around the leg to dissipate heat and reduce moisture levels, directional venting for protected areas, and a shock perforated foam inner with waffle weave wicking lining – lighter than neoprene and low water absorption, remaining protective even when warm.