Rubber soleProfessional comfort design: Our barefoot shoes are designed to fit the foot and feel comfortable. Long-term wear can strengthen the muscles of the foot.With stronger accessory muscles in the foot, injury rates were expected to drop and running efficiency would improve.Wide toe box: The minimalist trail running shoes have enough room to relax the toes and let them stretch naturally, making the feet more casual during exercise and helping to maintain balance.If your foot width is normal, the shoe width can be adjusted freely by elastic laces.Upgraded materials: The stretchy upper is very ventilated and breathable. Anti-slip rubber outsole provides great grip and protection. Soft removable insoles will comfort your feet all the time.They are all skin-friendly materials and you can choose to wear socks or not.Flat zero-drop sole: A zero-drop sole places your forefoot and heel in a flat surface which supports a healthy posture and puts less stress on the joints.The whole shoe is lightweight and flexible.They will be the shoes that you feel most comfortable and free to wear.Multi-functional shoes for various activities: These minimalist outdoor barefoot shoes are suitable for many occasions, such as training, walking, running, jogging, gym, hiking, biking, camping and so on. This pair of multi-functional shoes is a must-have shoe in your shoe cabinet.