Klim Aurora GTX Boot (5) 800 GRAMS OF 3M THINSULATE ULTRA INSULATION FOR MAXIMUM WARMTH (INCREASED FROM THE MENS VERSION OF 600 GRAMS) HEAVY DUTY 2.0MM HEAVY RUBBER AT TOE CAP TO RESIST HARDWARE IN FOOT TUNNELS MOISTURE WICKING LINER TO KEEP FEET DRY AND PROMOTE EVAPORATION THROUGH THE GORE-TEX STIFF DURABLE FOOTBED BOARD DISPERSES SHOCK AND PROTECTS THE BOTTOM OF FOOT, AND REDUCES FATIGUE COMES WITH 3 COLOR OPTIONS FOR LACES: GRAY, PURPLE, and BLUE