Icebreaker Puffer Jacket Womens Medium Purple Merino Wool Helix Merino Loft Insulated. The women's Icebreaker Helix Long Sleeve Zip is made with repurposed and highly insulating MerinoLOFT™, giving outstanding loft and minimal bulk. The recycled polyester exterior is durable and sheds light precipitation, while a wool lining ensures a cozy feel and breathability inside. Ideal for fighting off shoulder season chill and light rain as an outer layer, the Helix Long Sleeve Zip also makes an incredibly warm insulating layer for winter sports worn under a hard-shell.