I used the size chart provided on the product page and ordered Large. When they came in, I tried on pair on and they fit snugly but they were okay. I always wash clothes once before wearing. They were washed in cold water and hung to dry. They shrunk approximately one size. They really are a little too tight now. When ordering these, I recommend a size larger than what the sizing chart calls for, because even if you carefully wash them, they are likely to shrink.