I saw the thread on how the rubber puzzle mats are banned in Belgium due to toxicity, but I know some of these issues get overblown. The human body is constantly exposed to toxics, they're only dangerous in high doses. But who knows if a particular product is high.

Are people using them? The alternatives seem really expensive. $150 for a 4x6 foot cotton mat.

http://www.etsy.com/shop/PeppermintP...ion_id=7485974