OS1st THIN AIR PERFORMANCE CALF SLEEVES Color:Black Front: Run the 325

Front:  Run the  325

with GPS-based pace guidance for a selected course or distance

PacePro™ technology: Helps you plan your race day strategy

The redesigned Guide 15 delivers a comfort-first sensation that takes your run to new heights

and we did it

OS1st THIN AIR PERFORMANCE CALF SLEEVES Color:Black Front: Run the 325OS1st TA6 Thin AirTM Performance Calf Sleeves feature never before applied technology to keep your legs cool and protected during any activity. Created using 400n medical grade machinery and materials we are able to build in ease of use, comfort, and durability with the thinnest leg fabric profile ever made! The "Thin SkinTM" construction maximizes air flow achieving a cooling sensation to your legs thereby increasing stamina and endurance. Targeted