Size: 30*14*57cm Sandbag Trainer: Helps athletes such as sprinters, football players, and others strengthen lower-body muscles to improve speed, explosiveness, leg strength, and endurance. Durable & Waterproof: Made of thickened PVC material, the surface is waterproof and moisture-resistant. Both the trainer and weight bags are built to withstand drags and quick changes in direction, suitable for indoor and outdoor use. Weight Adjustable: Includes three removable weight bags, each capable of holding up to 10 pounds of sand (sand not included). Customize the weight from 10 to 30 pounds to match your training intensity. Multi-Direction Training: Enables training in various directions to enhance strength, stability, and mobility. Adjustable waistband with a soft, comfortable, and breathable lining, suitable for users of different body types. Multi-Purpose Use: Enhances sprinting drills and adds variety to workouts. Incorporate hills, directional changes, rows, drags, and more for a full-body workout with this versatile training tool.