Brushed fleece lining throughout the interior for extra softness and warmthStay warm without adding extra bulkDoubles as an undershirt or pajama topIdeal for a fitted, base layer look or order one size up for a relaxed fitS (0-2), M (4-6), L (8-10), XL (12-14), 2XL (14-16), 3XL (16-18), 4XL (18-20)