Doesn't move, jiggle, bounce, ride up or chafe due to the high-quality material. Comfortable material. Fashionable colors. SUPER STRETCHY MATERIAL: Our Cell phone holder for running has 2 separated, expandable and stretchy pockets (large and small) that fit your new iPhone XS MAX (also iPhone 5s, 6s, 6plus, 7plus, 8plus) and any other cell phone like Samsung s8, Galaxy s7, Note 8, Nexus 6p... Waist size from 27.5’’ - 40.5’’. Easily hold phone, keys, cards, money, even US passport.