Set of 2, for a total of 4 pieces! This is a set of two size 90 HEAT and COTTON material shirt undershirts, combining warmth and comfort. - Brand: BIRTHDAY PLUS - Model Name: FIBER HEAT - Material: HEAT and COTTON - Size: 90 - Quantity: Set of 2 Thank you for viewing. Immediate purchase is OK. Also listed on other sites. First come, first served, so it may be deleted suddenly. Thank you for your understanding. Will be folded small for shipping. Baby Kids Boys Girls Spring Autumn Winter Underwear Undershirt Rompers Long Sleeve Birthday