Engineered specifically for running

Silicone-ribbed strap

Additional cushioning throughout the sock for a more secure

Features grade 5

Bones® Swiss Ceramic Bearings 8mm 16 pack Nathan Engineered specifically for runningSwiss Ceramics: Bones Swiss Ceramics are in a class by themselves. If you want the best there is, this is it. The ceramic balls are much lighter, harder, stronger, waterproof, and longer lasting than the finest steel balls. Made in Switzerland. Features Accelerate faster. Roll faster and farther. Resist dirt and moisture better. Help to repair injuries to your races caused by dirt. 1 non contact, removable rubber shields allow easy cleaning. High