Size: Tall and skinny boys, listen up. I am 192 cm tall and weigh 79.4 kg. I bought XL. XL means wide. Sleeve length is satisfactory, about 36.5" cuff diameter is not adjustable. Material: very comfortable, not too heavy for summer, not too light for spring/fall. Brother, this is one hell of a shirt, but going down the next size will do undoubtedly be too short.