Icebreaker Size Chart An airy, ultralight tank inspired by sportswear but ideal for everyday wear, the Aria Sleeveless Combed Lines features a sporty design with a lightweight feel that's perfect for warm summer weather. This easy-wearing top features a side-split hem for ease of movement, and forward-set side seams for added comfort. Made with a super-soft, breathable and odor-resistant blend of merino wool with nylon for added durability. Features: - Regular fit - Side split for ease of movement. - Forward set side seams for comfort - Center back length: 70.6cm / 25 3/4" size M - Icebreaker hem wrap label - Weight size Medium = 170 g / 6 oz - 120 Featherweight 90% Merino Wool / 10% Nylon - Discontinued Style / Colorway