Large fits a circumference of the largest part of your forearm that = 11" on up Small fits a circumference of the largest part of your forearm that = less than 11"
On extended trips and aggressive rides arm pump (a tightening of the forearm muscles resulting in restricted blood flow) can be a serious problem that causes discomfort and a
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4arm strong
Product is made from good materials and it seems to work great. I can definitely tell an improvement in lack of arm pump while riding
