My son used these, but he's outgrown them, so I'm selling them. [Product Description] ◆ The Tech 2 Fin has been reborn as the new [SWIM Competitive Swimming Fin]. The ultimate hard type, ≪GOLD≫, surpassing the conventional colors and hard types, has debuted. ◆ Further improvements have been made to the conventional hard type, allowing it to fully unleash its potential as a power fin. It's also ideal for strengthening dolphin kick training. ◆ Manufacturer: Soltec-swim ◆ Model: hydro TECH2 Gold GOLD ◆ Size: M size 25.0〜26.5cm (8-9) = Length 35 x Width 19.5cm [Condition of the Product] ◆ There is a feeling of use because my son used them for practice.