The new POLAR WearLink+ strap is the ultimate strap for your Polar wireless transmitter. With sophisticated graphics, soft fabrics, a side opening hook for easy usage and new connector attachment, it’s the perfect solution to get your sensor strapped up and you ready to train. (The plastic transmitter is not included). Comes in 2 sizes XS-S, M-XXL

The XS-S will fit a 22" chest to a 38" chest.
The M-XXL will fit a 27" chest to a 60" chest.