Features: Improve swimming skills: By increasing water resistance during swimming, help swimmers exercise muscle strength, improve postures, and increase speed. Safe and effective: It can provide stable resistance training effects without posing safety hazards to users. It is a safe and effective swimming training tool. Comfortable fit: Made of Nylon+PP material, with good fit. The toughs and durable nylon webbing has good wear resistance. With 360degree rotating quick release buckle, it is firm and durable, with high flexibility and no twisting. Multiple sizes for selection: You can choose according to your personally needs and ability level. Users can gradually increase resistance, thereby gradually improving their swimming ability. Specifications: Material: Nylon+PP Color: Black/Yellow Resistance Umbrella Diameter: 20cm (7.87inch)/30cm (11.81inch)/40cm (15.75inch) Package Includes: 1Set Swim Parachute note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.