Our arm warmers are designed to sit against your skin in a nice comfortable fit. Bicep to fit measurement is below. You won't necessarily order the same size in arm warmers vs your jersey size, particularly if you have a particularly small or large jersey size. Vast majority order between XS to 2XL arm warmers, and most people order either S, M, or L. For example you might be a 3XL jersey for chest/body measures but arms/bicep might be XL or 2XL.

Given the arms fabric has plenty of stretch length is generally not an issue, the main size guide to follow is your bicep measurement to determine your size.