●Cotton Sweater Vest: It is made of mainly cotton. Ultra soft and cozy. Good quality. Soft cotton and elastic polyester used on the boys/girls cardigan, cozy and warm, no harsh chemical. ●Sleeveless Knitted Vest: It is knitted in weave cotton, Classic V-neck design without rubbing the neck, striped ribbed cuff & hem. ●The pullover sweater vest is comfortable for spring & autumn wearing as school uniform for students. Paired with long sleeve shirts, t-shirts, skirts for boys, girls. ●*** These sizes correspond to 4-5 Years / 5-6 Years / 6-7 Years / 7-8 Years / 8-9 Years / 9-10 Years / 11-12 Years. ●*** Due to the manual measurement, and our sweater is elastic, the measurement results may have an error of 0.4-0.8 inches from the actual size.