The 1/4" thickness with specially designed memory foam. Thick enough to protect your knees and joints, while still allowing you to grip the floor for balance, yet not too thick that causes you to lose your balance * Durable and Long Lasting material/ SGS approved Free from Phthalates/Latex/Silcone * Colors that Define your Inner Self/ Focal Point Icon to help concentration * New Mats take time to break in. Follow Yogi Tips included. If you continue to have slipping problem contact us for Slip Free Rosin. * Great Customer Service and all Products Guaranteed. Top Seller/Service Award Winner