Navy sleeveless sweater, comfortable to wear with a blend of acrylic and wool. - Size: M - Material: 55% Acrylic, 45% Wool - Color: Black - Design: Sleeveless Thank you for viewing. I am 165cm tall with an average build, but the shoulder width is covered, so I could wear it without worrying too much about my upper arms. You can wear it in the summer, but it's hot on hot days, so I recommend wearing it in the fall or spring.