It’s a one size for all. has an elastic style band from the front all the way around. About an 1inch think.
Very comfy!Given that a fair few of the tops pros are still wearing this cunning tech, why are so few Olympic marathon runners wearing them (women’s marathon finishes)?
Hassan and Obiri (Boulder CO) both wearing one, but Obiri ditched hers in the final 10km (when it was getting hotter).
Kipchoge wearing it in the olympic marathon is about the biggest promotion it can get. Not that it helped his result…
Hassan also wore it and won the womens marathon