OTHER COLOURS DESCRIPTION The iconic BIOM C is a trekking shoe reconstructed for urban environments. Crafted with an innovative leather combination and embedded with BIOM® technology that promotes natural movement, it is the ultimate sneaker to survive in the city. . LEATHER These two leathers create the softest but most technical combination. The abstract camo leather is nappa leather with a unique digitalized camo print, especially developed for W-21. This leather is highly technical as it is ultra light, ultra strong, ultra thin, and ultra soft. Celeste XA is the signature nubuck leather for W-21 and has a soft and soapy touch.