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.
TO FIT BICEP MEASUREMENTS
Extra Extra Small / XXS
Arm Length 45cm | Bicep 26cm
Extra Small / XS
Arm Length 46cm | Bicep 28cm
Small / S
Arm Length 47cm | Bicep 30cm
Medium / M
Arm Length 48cm | Bicep 32cm
Large / L
Arm Length 49cm | Bicep 34cm
Extra Large / XL
Arm Length 50cm | Bicep 36cm
Double Extra Large / 2XL
Arm Length 51cm | Bicep 38cm
Triple Extra Large / 3XL
Arm Length 52cm | Bicep 40cm