Only tried on, never used. 【DANBUOY】 Winter boots from Danbuoy. DANBUOY's round socks that keep your feet warm even when surfing in mid-winter. 5mm thick neoprene prevents cold water from entering, keeping you comfortable even in cold conditions. The round type provides a high level of fit for the toes, and is designed to feel less awkward inside the boots. It also makes board control easier, and is recommended as an essential item for winter.