Quick release buckle and strap system; Molded rubber walls at toe, heel, and side; 36 easily replaceable threaded steel spikes per pair; Threaded spike options include "Regular", "Sharp", "Long" and "Radial" Steel Spikes; "Regular" Steel Spikes for shallow penetration; "Sharp" Steel Spikes for deeper penetration into wood or ice; "Long" Steel Spikes provide extra traction and slight elevation; "Radial" Steel Spikes eliminate footprints for use on concrete and epoxy projects; 10 additional replacement spikes & 1 replacement buckle; Boot not included