A horse’s chests expand and contract as he breathes. These Air-Lastic™ technology girths expand as the horse breathes and then come back to shape immediately due to a flexible strip at the center of the girth. The Air-Lastic™ foam, with its 4 way stretch, will conform and mold to the horse’s shape as he moves. The foam is also 100% breathable and wicks moisture away. The contoured shape of the girth fits the anatomy of the horse so there is no interference at the elbow when your horse moves.