In years past, Nike used to make a forearm sleeve designed to hold an iPod. (I've used it for several years as a way to carry cash or card when I didn't have pockets.) This is the closest I've come to that... but this is WAY more stylish! Sleeves are dedicated for right or left arm. Random white-on-black sublimated pattern on heavy lycra. Moisture wicking material is lightweight and comfortable. I'll also note that, as a bartender who's situated right near a drafty door, these are great to keep warm at work! The nature of the fabric is that even when you get it wet (washing glassware) the moisture DOES NOT WICK UPWARD onto the dry portion of the sleeve! Dries quickly and looks great! Hidden pocket on the inside, upper end of the left sleeve is great for holding keys, cash or card. I think I would only change 2 minor details on this product: the shape of the thumb stirrups and the lack of silicone grippers. The sleeve puts minor pressure on the webbing of my thumbs, which feels a bit like chafing. Also, silicone grippers inside the open ends would help prevent slippage. Overall, and EXCELLENT PURCHASE! Would definitely consider purchasing a similar product from Nike in the future!