These mats have a tough Japan mat top texture that does not give any rug burns. Interlocking seams are very tight and will virtually disappear over time as the mats get used. Durable, shock-absorbing, grappling mats and judo floors. Our easy-to-assemble interlock puzzle style grappling mats are made of high-density EVA foam matieral that is closed cell and specifically designed for martial arts and combat sports. Made in 100cm X 100cm interlocking tiles, available in 2.5cm thickness.