? This puzzle mat is made of 0.4" thick EVA foam. This thickness provides a comfortable cushioned surface. ? Interlocking Alphabet and Numbers Floor Puzzle Colorful EVA Tiles for Girls and Boys. It's very Soft, Reusable, Easy to Clean. ? Each alphabet letters and numbers can pop out for hours of learning fun. Learn to recognize alphabet and letter shapes, and colors. ? Great for your home, classroom, or even daycare, get a puzzle mat today and watch your children thrive!