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Orthotix Advice Centre

How Should a Waterproof Cast Cover Fit?

A good seal depends on both size and position. This guide explains how a cast cover should sit and the warning signs that the fit is too tight or too loose.
How Should a Waterproof Cast Cover Fit?

Quick Answer

A waterproof cast cover should fully enclose the cast or dressing, with the sealing opening sitting flat against healthy skin above it. The seal should feel secure without causing pain, numbness, colour change or excessive pressure. The cover should not be overstretched around a bulky cast.

Where should the seal sit?

The sealing ring should sit on intact skin above the cast or dressing, not directly over the cast edge.

How much overlap is needed?

There should be enough healthy skin above the protected area for the seal to make continuous contact all the way around the limb.

How tight should it feel?

It should feel snug enough to resist water entry but should not feel painfully tight or cause pins and needles, numbness or visible colour change.

What if the cast is bulky?

A bulky cast needs enough cover width so the sleeve can pass over it without overstretching or damaging the seal.

Should the cover have folds?

Some loose material around the cast is normal, but the sealing area itself should lie flat against the skin.

How do you check the fit before showering?

  1. make sure the cast or dressing is completely enclosed;
  2. check the seal is above the cast on healthy skin;
  3. smooth the seal all the way around;
  4. confirm it is not painfully tight;
  5. check the sleeve has not twisted.

What if the cover keeps sliding?

This may indicate the cover is too large, the sealing area is damp or the limb shape makes the chosen size unsuitable.

Important: Do not use tape, elastic bands or additional tight straps around the limb to force a poor-fitting cover to seal.

Waterproof Arm Cast Cover

Waterproof Arm Cast Cover

The Waterproof Arm Cast Cover is a reusable, airtight protective solution designed to safeguard casts, bandages, and orthotic devices from water exposure during bathing or showering. Crafted from impermeable, flexible material, it ensures durability and comfort. Its anatomically designed shape, combined with...
£19.95
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When Should You Seek Professional Advice?

Stop using the cover if the sealing area causes numbness, marked redness, swelling, colour change or increasing pain. Seek advice if the cast is unusually bulky, extends very close to a joint or a standard cover cannot be positioned safely.
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