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: Make of Nylons and PP materials, with good fit. The toughs and Enduring nylons webbing have good wear resistance. With 360degree rotating quickly release buckles, it is firm and Enduring, with high flexibility and no twisting. Comes with a storage bag, easy to carry. 3 size for selection: You can choose according to your personally needs and ability levels. Users can gradually increase resistance, thereby gradually improving their swimming ability. Specifications: Materials: Nylon and PP Color: Black/Yellow Swim Parachute 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 surely that you not mind before order. Due to difference between different monitors, the picture may not reflect the actual color.