The Indu Eco Mock sweater includes FSC-certified viscose derived from nature, 22% RWS-certified extra-fine merino wool, 5% alpaca wool, and 35% nylon for durability. Its a good choice when you need warmth from a sweater, but not necessarily at the level required for polar expeditions. Note! Unlike in the product image, the torso of the shirt is as wide as it is long, and very, very spacious. Choose at least one size smaller than the chart suggests. Note! Unlike in the product image, the collar is quite narrow. Sherpa Adventure Gear donates an amount equivalent to one day of schooling for every Sherpa product purchased to the Room to Read organization's Nepal Education Program. - Wide fit - The shaped collar is considerably narrower than in the product image - Center back length of 63.5 cm "Indu" is a popular Hindi name that means "moon" or "woman of the moon."