The Icebreaker Ellipse range features hybrid midlayers that provides an ideal combination of warmth where you need it, light weight, and breathability. Hybrid construction incorporates 75% merino/25% polyester with lightweight 70 gram MerinoLOFT insulation in the chest and head areas. The Icebreaker Ellipse range are great mid-layers when it's cold as well as stand alone pieces when it's cool. An added bonus is that the woven polyester and the MerinoLOFT wool insulation are recycled.