This is a pair of orthotic insoles, which is made of premium, breathable, and elastic material for durable wear. This pair of arch insoles fit most size shoes, allowing you to enjoy exercising, running and hiking without heel pain. for boys and girls all day use. Features - Color: As shown. - Material: EVA and lint. - Size 20-21: About 15x6.6x1cm. - Size 22-23: About 16x6.7x1cm. - Size 24-25: About 17x6.8x1cm. - Size 26-27: About 18x6.9x1cm. - Size 28-29: About 19x7x1cm. - Size 30-31: About 20x7.1x1cm. - Size 32-33: About 21.5x7.3x1cm. - Size 34-35: About 23x7.5x1cm. - Size 36-37: About 24.5x7.7x1cm. - Size 38-40: About 26x7.9x1cm. - and high quality. - Breathable, comfortable and non-slid for boys and girls all day wearing. - Suitable for for poor foot walking posture, long-term walking. - Insoles are contoured to improve the foot to function correctly and eliminate pain. - Orthotic insoles with specially designed arch support and foot alignment.