Cork Space is an eco yoga mat that can handle repeated demanding use. Although at first glance they may appear similar, cheaper TPE (Thermoplastic Elastomers) or PER alternatives differ significantly in performance and in their environment impact.
TPE is the acronym for ThermoPlastic Elastomers, a class of copolymers that have the elastic properties of rubber and re-meltable property of thermoplastics.
They're are a number of variations that can be derived from polyester, styrene, polyurethane and host of others. (source)
PER is PVC that has been stabilised with acetyl tributyl citrate instead of phthalates and lead.