Won't slip off clothing or get lost.  Easily adjust strap with one hand without removing. Armband flexes with arm movements. Made of .020" thick vinyl on front and .030" thick vinyl on back. White Adjustable Armband with Velcro Closure. Outer dimensions of 5-1/16" x 2-7/8" with Insert dimensions of 3-3/8" x 2-3/8".  Vertical Orientation. 100 per Bag. Priced per Bag.