100% 18.5 Micron Merino Wool 230 g/m2 Interlock knit construction * Midweight baselayer * Flat lock seams to prevent chafing and Machine washable and machine dryable * Garment Weight Size Large = 11.2 oz (315 grams) * Available in Men"s Sizes: XS to 6XL (4XL to 6XL in Black Only) Tall sizes (in Black only) Available in Med Tall to 4XT