Call it a fanny pack, a belt bag, bum bag, or a waist pack — I’ve owned many ... The best ones are made of sturdy materials, like polyester or neoprene, and can handle being stuffed full ...

BEST SOFT NEOPRENE FABRIC MAKES YOU SWEAT LIKE ... stay put during exercise. The waist trimmer belt also helps to trim your waistline while you work out, so you can see results faster.