Reparel non-compressive  undersleeves are breathable, designed for extended wear, and help to resolve inflammation while providing a more comfortable fit for your boot. 
 
latex free and can be worn on the right or the left foot. 
 
Sizing:
Small fits up to Men's 8.5 and Women's up to 9.5 with a calf size of up to 14"
Medium fits Men's 9-10.5 and Women's 10-11.5 with a calf size of up to 15.5"
Large Fits Men's 11 and up and Women's 12 and up with a calf size minimum of 14"