pepe47 said...
My reasoning is that they hold the intended shape of the strap.
Trouble is that by permanently having pressure on the strap, you compress the neoprene padding in the strap, and worse yet, compress the foot bumpers built into the board.. I used to use tennis balls until I realised what it was doing to the padding.
The only real solution is to go out and upgrade to some really good quality straps..