Vinyl. Extra Wide Bath Mats: No chemical smell, vinyl grade material. The standard, sturdy dimensions and rectangular shape make it lay flat on any smooth tub floor. Strong suction cups provide 360 degree safety protection for users. YINENN bathtub mat is a great choice for home, gym, spa and more. Multi-Functional and Utility: Looks like a pebble design, provides massage experience in the shower as it comes with 200 suction cups, with necessary anti-slip function, while YINENN Extra large mat is 40cm x 100cm, which provides a great coverage and also has small holes to allow water to flow through. To clean anytime, just throw the mat in the machine and enjoy its fresh look. Air dry for years of safe, healthy, and hassle-free use. Disclaimer: YINENN tub mat only attaches to smooth and clean surface. Do not use on textured, tiled or non-smooth surfaces. Do not use bath oils for slips. It is recommended to let the mat air out in a well-ventilated area for 24 hours before use if you experience a strong odor when first opening the package.