The merrell all out blaze sieve sandal combines speed and stability with a lightweight and airy construction it is treated with m select fresh odour control to keep feet fresh and a unifly midsole offers underfoot comfort and protection features nubuck leather and fabric upper lycra neoprene stretch collar for easy on and off m select fresh antimicrobial agents reduce shoe odour unifly midsole connects you to the trail protects you from the terrain 3mm lug depth tc5vibram outsole weight 29