JACK1T technology
ONELOFT™
Our own insulation. Engineered in London, exclusive to JACK1T.
Insulation is the heart of a jacket. It decides how warm you are, how light the jacket feels, how it packs, how it washes and how it handles a week of weather that will not make its mind up.
So we built our own.
ONELOFT™ is JACK1T's exclusive insulation technology, developed to deliver the loft and warmth of premium down in a technical fill that thrives in real conditions. It is found in one place only: inside a JACK1T.
Warmth without bulk
ONELOFT™ fibres trap air the way high fill power down does, creating lightweight warmth with a clean silhouette. You stay warm and the jacket stays sharp.
Performs when wet
ONELOFT™ keeps insulating in rain, drizzle and the kind of damp that defines a British winter. It dries fast and bounces back to full loft.
Machine washable
Wash it, dry it, wear it. ONELOFT™ holds its structure through the wash cycle, so caring for your jacket is simple.
Packs down, springs back
Compress it into a bag, shake it out at the other end. The loft recovers, ready to go again.
Hardy by design
Built for daily wear. Commutes, school runs, festivals, flights. ONELOFT™ is engineered for the life the jacket actually leads.
Animal free
ONELOFT™ is a fully synthetic fill, making it a vegan friendly choice without compromise on warmth or feel.
ONELOFT™ or down
Some JACK1T pieces are filled with ONELOFT™. Others are filled with responsibly sourced down, certified to the Responsible Down Standard. Both are premium. The choice comes down to how you wear it.
Choose ONELOFT™ if you want
Easy care, fast drying performance, dependable warmth in wet weather and an animal free fill.
Choose down if you want
The classic warmth to weight ratio of natural down, responsibly sourced and certified.
Selected styles are available in both fills. Look for the fill selector on the product page.
Questions, answered
What is ONELOFT™?
ONELOFT™ is JACK1T's exclusive synthetic insulation technology, engineered to deliver lightweight warmth that performs in wet weather, washes easily and packs down small.
Is ONELOFT™ as warm as down?
ONELOFT™ is engineered to match the loft and warmth of premium down while adding wet weather performance and easy care.
Is ONELOFT™ vegan?
Yes. ONELOFT™ is a fully synthetic fill and contains no animal derived materials.
Can I wash a ONELOFT™ jacket?
Yes. Machine wash at 30° and tumble dry on low. The fill recovers its loft after washing.
Which JACK1T products use ONELOFT™?
Look for ONELOFT™ in the product specification. Selected styles are available in both ONELOFT™ and RDS certified down, with a fill selector on the product page.
Is ONELOFT™ available anywhere else?
ONELOFT™ is exclusive to JACK1T.