The Thermoball Zip-In jacket features Technology produced by the North Face’s collaboration with Primaloft®; an extremely light, synthetic insulation that traps heat within the miniscule air pockets in the coldest conditions, retaining the warmth for day long comfort. Research by Kansas University has shown that the effectiveness of Thermoball insulation is equal to 600 goose down, showing the extreme insulation pedigree and technological advancement. When wet, the Thermoball comes into its own, retaining full insulationto give maximum performance, even during the most terrential downpour. Another advantage of Thermoball over other traditional down jackets is its compression. Able to pack down into its own pocket, the Thermoball Zip-In Jacket offers unrivalled storage, transportability and weight. For extra protection, The North Face have included a hem cinch cord and secure hand zip pockets to place cold hands or securely store phones and keys. For revolutionary insulation technology and outstanding quality, The Thermoball Zip In Jacket is essential.