The PR1-e Thigh Bag allows for the adjustment to fit via the use of two separate Nylon Straps. Fitment for those with a leg circumference approximately between 43.5 to 64.5cm or 17" to 25.5". The straps give 16cm or 6.5" of adjustment and the twin embedded elastics provide an additional 6cm or 2.5" of tension or added length.