Details, Size & Fit. The grey marle Gym Vest is part of Siksilk's gym collection. Made from a four-way stretch knit jersey, The piece has a low scoop neckline and a racerback design. Our model is wearing a size medium tank, and usually takes a size medium/42 shirt. He is 6’2” (188cm) tall with a 40” (101cm) chest and a 32” (81cm) waist. Length: 82cm Slim fit Four-way stretch fabric wicks moisture away Grey marle finish Low scoop neckline Racerback design for freedom of movement Signature branding printed near Thehemline in black.Cold machine wash. Length: 82cm.Material: 92% Polyester & 8% Elastane.SKU: SI490AA54ODH.