The Infinity Alpine Jacket from Rab is a very warm and highly protective jacket. The shell of the jacket is made from GORE-TEX INFINIUM fabrics for incredible weather protection and robustness with minimal weight. This is aided by Rab's unique interstitch manufacturing technique, which is far more resistant to water ingress than standard stitch-through construction. 800 fill power NikWax hydrophobic down provides plenty of warmth for low weight and small pack size and is resistant to soaking. The roomy cut and helmet-compatible hood make this jacket ideal for throwing on at icy belay stances or for summit lunch stops in the middle of winter. If you're looking for a belay jacket for use in sub-zero, stormy conditions, then the Infinity Alpine jacket will not disappoint. Men's Rab Infinity Alpine Jacket - Deep Ink / Ink | George Fisher