Safe, Breathable and antibacterial with elastic band. Safe Elastic Bottom and tied waistband Mid Mesh Design, more suitable for outdoor sports like running ,hiking , tennis. Special attention to our size chart images displayed or contact us about your size selection. Occasion: Outdoor and Indoor lifestyle Return Policy: Free exchange for wrong item shipped or damaged. For not-liked-style or not-fit-size reason, customer's responsibility to return the items to China. Thanks for your understanding!