According to the size charts provided by Protec Direct, 3XL in the UK corresponds to a chest size of 116-120 cm or 45.5-47 inches for men. Chatleys Menswear provides a similar size guide, stating that 3XL corresponds to a chest size of 127-132 cm or 50-52 inches. Big Fish Clothing also states that 3XL corresponds to a chest size of 127-132 cm or 50-52 inches. Therefore, 3XL in the UK corresponds to a chest size of approximately 45.5-47 inches or 50-52 inches for men, depending on the brand.