BUYKUDKids' Girls Boys Long Sleeve Athletic Base Layer Compression Underwear Shirt & Tights Set Unisex

“hi, i have a 7 year old with growth issues. he is 110cm and waist 43cm. not sure whether to go for size 4-5 or 6-7, can you help please? thanks”

Are these navy or black?

Is this suitable for water sports ?

Should you get the black/fleece or black for under football kit for winter months?