【Birkenstock】 Blue Footbed Tradition / Black / Insoles ⚠️The size is written as 230, so I think it's a 36 (23.0-23.5), but... it's common to buy these about 2 sizes smaller, so I usually wear a 38 (24.5). For reference ⚠️ I bought it at the LaChic directly managed store for about 5000 yen. I've only used it once or twice. The Blue Footbed Tradition is an insole designed with a lower lateral arch and a higher longitudinal arch, so you can use it with heeled shoes like leather shoes and pumps. Cork is used for the main body, and the elasticity and hardness unique to cork accurately support the three arches of the sole (※see reference). It is a 3/4 size to accommodate the forefoot, which varies in length depending on the person, so you can experience the functionality of Birkenstock without changing the size of your shoes, even with shoes with thin toes or narrow shoes. ※The three arches of the sole: The three arches, called the inner longitudinal arch, the outer longitudinal arch, and the lateral arch, support the body in a balanced way. ■Features Recommended for heeled shoes, formal shoes, leather shoes, and shoes with unstable heels (shoes with soft and roomy shoes, and shoes with flat and thin soles can be said to be shoes with unstable heels). Easy to install, just put it in your shoes. No need to fix it with adhesive tape, and you can replace it with various shoes, so it's an insole that's friendly to your wallet ◎ *Depending on the height of the heel, the insole may not fit.