Second generation upgraded version, thickened steel 3mm, high-strength stainless steel preservation spring. 3000 consecutive jump experiments. Make sure you can jump safely! Unique frame structure, folding size reduced to 1 / 4! Easily store your trampoline, bed, sofa, car trunk, wardrobe, etc; The unique 28 closed spring design connects the waterproof PP pad that is easy to clean and provides a powerful elastic recovery system, which is suitable for players over 6 years old to be efficient and safe; 360 ° surrounding environmental protection cover PVC pad with closed spring design. Keep away from sharp parts to make you safer and avoid injury; A 10 minute bounce is equivalent to jogging for an hour, cycling for 30 minutes or swimming for 20 minutes. Make trampoline a part of life;