I/O Merino Elemental Jacket (Green) The Colossus fabric is a mid weight 260gsm waffle texture fabric, knitted used 18.5 micron full-fleece 100% full-fleece MicroMerino Imported All I/O Merino fabrics are fully machine-washable. Made from 100% wool 'Colossus' MircoMerino waffle fabric. The waffle texture of this fabric has great thermal properties by capturing the body heat between the ridges. Raglan sleeves for ultimate backpack compatibility Contrasting coloured zip and vintage-look arm badge, to get the real I/O Merino look