Our warmest base layer bottom for those who feel the cold. The Men's Heavyweight Grid Fleece Bottom is crafted from our 280gm Signature Merino Blend fabric that melds the luxuriously soft on-skin properties of rayon from bamboo and the unrivalled odour resistance of merino wool. We’ve engineered the interior with a 3D grid texture for added micro-air-pocket warmth and an extra soft plush skin touch.