Just like those old Choose Your Own Adventure books, The North Face lets us choose how to layer up with the versatile ThermoBall Eco Snow Triclimate Jacket. This system pairs a 2-layer waterproof shell with the popular ThermoBall insulated puffy jacket to mix and match for the best balance of weather protection and warmth for changing climates. We can zip both jackets together for cold and wet conditions that call for warm and waterproof layering, wear the ThermoBall jacket on its own in cool and dry conditions, or wear the shell solo for mild and wet weather. This Tri-Climate system gives us three season versatility and costs less than buying our mid layers and outer layers separately.