In general, arm warmer size should be the same as your jersey size. However, since jersey fit & cuts can vary, please verify size with our sizing chart. Warmers are designed with enough length to comfortably fit high on the arm for a secure fit that won't slip or create gaps between jersey and warmers.
Fabric has fair amount of stretch so if you are between sizes you can size down for a tighter compression fit, or size up for a softer fit.
"never have i worn a pair of armwarmers that felt as if they were a physical part of the jersey with which they were worn. terry lined, they offer a persistent dry feeling that exists even under swot and hetty conditions. they are, to be quite frank, absolutely superb."
– The Washington Machine Post