Relaxed fit 3-in-1 design for a waterproof, breathable and windproof outer shell DryVent 2.5L stretch shell with a removable ThermoBall -insulated inner PrimaLoft ThermoBall synthetic insulation in body and collar Zip-in-compatible integration with complementing garments from The North Face Attached, fully adjustable hood Pit-zip venting and a drawstring hem for custom coverage Two jackets, three different weather situations - triclimate jackets are based on the original mountain layering system and, as such, are really versatile. For the ThermoBall Eco Triclimate Jacket, The North Face have combined a waterproof, windproof and breathable 2.5-layer DryVent shell with a recycled polyester insulation layer. What's so special about that? The ThermoBall Eco insulation maintains its warmth even when wet, making it the perfect partner to a waterproof shell.