Exervo HD28 1.1" Thick Premium EVA Foam Interlocking Protective Exercise Floor Mats - 2'x2' Tiles - Interlock Finished Edges Included 1.1" thick cross-linked, high density, Exervo premium EVA foam interlocking mats. Edging included! Infinitely expandable- add more sets to cover larger areas. Includes finish borders Transform your floor in minutes- easy, low cost solution that's easy to assemble EVA foam is a warm comfortable surface with no odor. Impervious to sweat & moisture ASTM F963-07 Flammability Tests- PASSED EN-71 Toxic Elements Analysis- PASSED