Our Sport and Safety mats serve a range of activities, and are suitable for martial arts and any strenuous activity -- from Aerobics to Yoga. These mats may be used anywhere indoors, and can be used outdoors in shaded or partly sunny areas on a solid subsurface.  Water will not harm them, but exposure to direct sunlight will cause certain colors to fade and shorten their useful life.  If you are going to use them outdoors, it is best to provide a cover, like indoor/outdoor carpet or grass, to protect the mats from the sun's UV rays, which will ultimately break down the foam surface.

INFORMATION:  Some internet mat companies insist on advertising that a 20 Millimeter mat is 7/8 or even 1 inch thick.  Our calipers say that 20mm is closer to 3/4 inches.  We think that calling a 20mm mat 7/8th inch thick is dishonest.  It makes it sound like it's "almost an inch", when in fact it overstates the actual thickness by almost 25%.  Because of this situation on the Internet, we strongly suggest that you get samples of any "7/8 Inch" or "1 Inch" thick mats and measure them for yourself.  If you order 7/8 or 1 Inch thick mats and what you get is 3/4 Inch thick mats, return them and demand a refund.