Two measurements, five minutes.

Get these two numbers and the size follows. Between sizes, choose the larger — the cuff tightens down but does not open up.

Floor to the top of your knee

Stand upright with your shoes off, on your sound leg. Measure from the floor to the top edge of your kneecap. Have someone else hold the tape if you can — leaning over changes the number.

This sets the frame size.

Thigh circumference at the widest point

Sitting down, measure around your thigh at its thickest — usually about 5 cm below the groin. Snug but not tight, over light clothing or bare skin.

This sets the strap length.

Frame size

Size	Floor to top of knee	Typical height	Notes
Small	40–48 cm	145–160 cm	Teenagers and shorter adults
Regular	48–58 cm	158–182 cm	Around three quarters of orders
Tall	58–66 cm	180–198 cm	Long-legged builds

Strap length

Strap	Thigh circumference	Notes
Standard	46–60 cm	Fits most people
Long	58–76 cm	Heavier or more muscular thighs