No more fiddling around with plastic cable ties at the race! Put it on easily and quickly around your ankle and take it off just as easy and quick after the race. This is a comfortable neoprene strap with Velcro closure. Attach the computer timing chip for your race and eliminate the uncomfortable chafing around your ankle. It now fits smaller ankles too! One size fits all. Perfect for any athelete doing any race from 5k to marathon to IronMan triathlon Very comfortable