Closed cell EVA foam tiles will not allow liquids to penetrate the surface. Great for pre-schools, hospitals, gyms, health clubs, trade shows, factories, warehouses, play areas, day care, fatigue relief and more. Install in minutes, no adhesive required. Just snap together and your ready to start enjoying. Lightweight and portable so you can bring them almost anywhere. Our exercise mats works well under treadmills, ellipticals, steppers & more.