Our premium offering in the base layers collection, the Heliox pants (which perfectly pairs with the base-layer shirt of the same name), is all about multi-season adaptability and comfort. Keeping it simple Keeping the design aesthetic unclouded allows the product to do all the talking. The densely knit Heliox pants are comprised of only a crotch panel and inseam seams. Fewer seams mean fewer pressure points pressing close against the skin.