Is there any official certification system for Judo mats?
What specific characteristics should one be looking for in a Judo mat? Remember the primary purpose of the Judo mat is injury prevention.
Assume a hard unsprung floor underneath the mats (eg concrete garage).
Please address all of the following factors:
- thickness (I've heard varying advice...anything from 1 inch to 2.5 inches, what's the minimum for injury prevention)
- material type (eva crosslinked foam?)
- material density (different densities affect the impact absorption characteristics)
- longevity (I've heard it said that EVA foams are sacrificial, so that they break down over time and lose their impact absorption qualities)
Extra points for the effects of UV (for outdoor use), on the mat in your answer.