DESC: Replacement WearLink Strap. This is a replacement strap for the Polar Wearlink transmitter including the WIND wearlink transmitter (The plastic transmitter is not included). Comes in three sizes XS-S, M-XXL and XXL The XS-S will fit a 20" chest to a 30" chest. The M-XXL will fit a 28" chest to a 45" chest. The XXL will fit a 40" chest to a 60" chest. Note: Measurements include Wearlink connector. The Complete set is available here - Complete WearLink