Red Neoprene 2 Pcs Arm Trimmers With Pockets Arm Shaper. This Arm Trimmer is the perfect combination for all your workout routines. It will provide you with the best quality material to help you achieve results quickly and have thin arms. Adjustable sticker design, you can adjust the size yourself; Pocket design can apply to a variety of screen mobile phones; Neoprene material for increasing the heat and sweat in your bicep area.