What's the difference between a foam roller and 4" PVC?

TJ that foot rolly thing

TJ that foot rolly thing looks interesting. When would you suggest to use it? (i.ei. after a run or in the morning, or at night?). i ask because my feet are usually a bit stiff first thing in the morning and this might reduce that.
 
If your feet are stiff in the

If your feet are stiff in the morning, that might be a good time to try it, although I think anytime would be a good time to use it. Just make sure you are sitting down to use it. If you stand over it to use it, you could put too much pressure on your tissues and damage your feet. Search www.FootSmart.com for plantar fasciitis to find it.