Featuresr size is optional waist measurement seuwaist 29 37in meuwaist 31 39in leuwaist 32 40in xleuwaist 34 42inr quick dry function and make you feel more comfortabler it can keep you dry and cool in the hot condition and warm in cold conditionr even you are sweaty it will never adhere to your skinr reflective brand logo on front side to keep you safe in darknessr the waist strap can be adjusted to fit your sizer perfect for cycling riding racing climbing or cam