I've only tried them on indoors. *These will be shipped without the box. Slippers that train the adductors with an inward slope The inward slope puts weight on the inner thighs of the lower body. These slippers allow you to focus on training the adductors, pelvic area, and O-leg countermeasures, which are difficult to train normally. [Point 1] The design, with the inside lower than the outside, causes the heels, which are facing outwards, to move inwards, training the inner muscles of the foot (adductors) that are difficult to train normally. [Point 2] The three-dimensional insole and arch of the foot fit the sole of the foot, making it difficult to slip off and reducing foot fatigue. ●For those concerned about O-legs ●For those who want to train their adductors ●For those who want to train pelvic distortion and pelvic floor muscles Color ・Bordeaux Suitable Size / Weight (approx.) 23.0〜24.5cm / 300g Material Upper: Synthetic leather Insole: Synthetic leather Foot bottom: Polyethylene Country of Origin Made in China Alphax Suriet O-TYPE White Brand: Alphax