Knee supports for large legs

Can anyone help?

My husand has been told by his physio that he can start running and cycling again, but that he should wear a knee support (he has an old torn cruciate ligament injury). The trouble is, he has what I'd describe as (lovely) rugby player-type legs! He's tried on a few but they all seem to roll down when he starts moving. We're choosing the correct sizes, by the leg measurements, and even trying the next size up (which ends up having less support) but they're all the same.

Can anyone please recommend a support which doesn't roll down?

Failing that, I am considering inventing over-the-shoulder braces for the damned things!!!

Thanks x

 R2F do a wide range of knee support, you may be able to find something which suits your requirements, they are also pretty good for advice and returns should the product not suit from my experience.

http://www.return2fitness.co.uk/Supports_and_Braces/Knee_Supports