Reddit reviews Performix 11603-6 Synthetic Plasti-Dip Rubber Coating, 14.5 oz Can, Black

Try using this stuff, works great!

http://www.amazon.com/Performix-11603-6-Synthetic-Plasti-Dip-Coating/dp/B0000DD1PF

I've been using it on my controllers as preventative maintenance, before they get destroyed.

For a cheap fix, you can try something like Plasti-Dip This is the rubber material used to coat tool handles.

Or for a more professional finish, you can buy soles or soling material and glue and stitch actual soles on the bottom: http://www.algeos.com/acatalog/soles_and_heels.html (Edit: I did a google search and this was the first result, I bet you could find something on Amazon too)

Plastidip them? It should peel off when you need to return them.

http://www.amazon.com/Plastic-Dip-Intl-11603-6-Plasti-Dip/dp/B0000DD1PF

Also, worst case scenario if the plain handles aren't feeling too great, you can use either 1/4" heat shrink tubing or Plastidip

I was thinking I'd use Plasti Dip as it should be easy to dip each tip in it.

http://www.amazon.com/Performix-11603-6-Synthetic-Plasti-Dip-Coating/dp/B0000DD1PF/ref=sr_1_4?ie=UTF8&qid=1382526932&sr=8-4&keywords=plastic+dip