Arm sleeves are made of high tech 4-way stretch material Moisture wicking fabric acts as cooling system on hot days Protects arms from harmful effects of the sun Helps keep you warm in cooler temperatures Easily slips on and off Non-slip silicone gripper at bicep Please note this design comes with two distinct background colors on the artwork. It is a subliminal trick meant to fool the eye of the viewer into thinking each arm's art is distinctly different.