What is the Mueller Wrist Brace (with Splint)? Perfect for providing support following a broken or sprained wrist. This lightweight wrist brace features an aluminum splint & adjustable Velcro straps. When can I use it? Perfect for providing support & relieving strain following wrist sprains & fractures. Lightweight design makes it absolutely ideal for those who want to continue with work & resume sporting activities. Which size do I need? One size fits most. Measure around the wrist, for circumference of 15-22cm. Fits either wrist. How does it work? The enclosed aluminum splint keeps the wrist in a slightly extended position. This relieves the strain on the tendons that cross over the wrist joint & helps to provide support to the unstable wrist. The wraparound design & Velcro straps allow gentle compression to the whole wrist region for added re-assurance. The Wrist Brace with Splint allows full finger movement, which means that its particularly useful during sports & work related activities.