The RespiBelt Breathing Training Device fits around the lower chest and ribcage and provides a training load to the breathing muscles as the chests expands during breathing The RespiBelt provides an effect similar to training at altitude, adding resistance for the muscles of breathing and helping to provide you with a competitive edge. Cool wash (40°C). Do not iron or tumble dry. Protect other items in the wash by washing the belt inside a pillowcases or wash bag.