MADE FROM AN ENHANCED 100 NATURAL RUBBER COMPOUND. 'PULSE GRIP' TREAD PATTERN DESIGN HAS A KNURLED TEXTURED LINING WITH A WIDE THICK HEEL STRAP TO GRIP ON TO FOOTWEAR BETTER AND KEEP TRACTION AIDS IN PLACE FOR A LONGER WEARTHE 6 TUNGSTEN CARBIDE ICE DIAMOND SPIKES ALONG WITH THE BI-DIRECTIONAL TREAD PROVIDES POWERFUL TRACTION WITH MAXIMUM GRIP FOR AN OPTIMAL PERFORMANCE.