nti-fatigue AirFlex ® floor mats feature a unique, raised-dome design that provides excellent relief from back and leg stress resulting from long periods of standing. Raised domes on the anti-fatigue floor mats flex or compress as you step on them and then return to their original shape. Flexing action cushions the feet and provides outstanding anti-fatigue properties. These anti-fatigue floor mats are made of 100% nitrile rubber for superior grease, oil and chemical resistance. Coarse grid pattern on raised domes reduce the chances of slipping. 2'x3' mat weighs 6 lbs. and the 3'x5' mat weighs 14 lbs. Black color. USA made. Specify size from the selection box above.