Material and build: Made from EVA foam (Fubbells F of EVA foam) for lightweight strength. The foam provides buoyancy and long-lasting durability, resists water and debris, and dries quickly after use. Key benefit — stronger, safer water workouts: These water weights add controlled resistance to pool exercise, challenging muscles underwater to build upper body and back strength, improve endurance, burn more calories, and increase flexibility without heavy impact on joints. Portability and convenience: Compact, lightweight design makes them easy to carry to the pool, spa, or gym. They store and dry quickly so you can use them regularly without extra maintenance. Performance and function: Designed specifically for aquatic resistance training and water aerobics. The foam construction creates underwater drag and resistance while remaining comfortable to grip. Compatibility and use guidance: Suitable for adults and children for pool and spa exercise. Not recommended or certified as a flotation device — intended only for resistance training and fitness. Use scenarios: Pool aerobics class: Add these water weights to your group or solo routines to increase upper-body and core resistance during cardio intervals and strength sets. Rehabilitation and low-impact strength training: Ideal for post-injury or joint-sensitive workouts where land-based weights cause discomfort; use them to progressively rebuild strength with minimal stress. Swim training and cross-training: Incorporate into swim drills or water circuit training to boost muscular endurance and overall calorie burn while maintaining low impact. What makes these stand out: EVA foam (Fubbells F) resists water absorption and debris for hygienic, low-maintenance use. Provides effective underwater resistance while remaining lightweight and portable. Versatile for adults and children, suitable for pool and spa fitness routines. Note: For safety, do not use as a flotation aid. Follow standard pool-safety practices when exercising in or around water.