Marmot Ajax boys' down puffer jacket, Cobalt Blue, Size Large — 600 fill, water-resistant

This compact, winter-ready jacket combines high-loft down insulation with weather-resistant fabrics and kid-focused features. Built with 600 fill power down treated with Down Defender, the Ajax holds warmth even when conditions get wet. The shell uses a 100% polyester mini ripstop with a durable water-repellent finish to fend off light precipitation, while design touches such as zippered hand pockets, a wind flap, and elastic-bound cuffs focus on comfort and fit.

How does the Ajax keep a child warm in wet or snowy conditions?

The jacket pairs lofty 600 fill down with Down Defender, a moisture-resistant treatment that helps the down maintain loft and insulating ability when damp. The outer fabric’s DWR finish sheds light moisture so the insulation performs longer between dryings.

• 600 fill power down for efficient warmth-to-weight ratio
• Down Defender treatment reduces clumping when wet
• Durable water-repellent (DWR) finish on mini ripstop shell
• Wind flap behind the front zipper to block drafts

Will my child be able to move freely while wearing it?

Yes — Marmot’s Angel-Wing Movement is built into the jacket to preserve arm mobility during play and layering. That design detail keeps the jacket from restricting natural motion, so kids can play, pack backpacks, or climb without feeling constrained.

• Angel-Wing Movement for unrestricted arm motion
• Lightweight construction reduces bulk under outer layers
• Elastic-bound cuffs retain fit without limiting flexibility

What practical features help kids use this jacket every day?

The Ajax includes everyday details that matter for school, travel, and outdoor play: zippered handwarmer pockets secure small items and keep fingers warm, elastic cuffs seal out drafts, and the compact profile stashes easily when indoors.

• Zippered handwarmer pockets for warmth and secure storage
• Elastic-bound cuffs for a snug fit and heat retention
• Wind flap behind zipper reduces cold air intrusion
• Durable mini ripstop fabric resists snags and abrasion

How should I care for the jacket to keep insulation performing?

Care is straightforward: wash gently on a cold cycle with mild detergent, tumble dry low with clean tennis balls or dryer balls to help re-fluff the down, and avoid fabric softeners or bleach. Regularly reapply DWR if water stops beading on the shell.

• Machine wash cold, mild detergent; no fabric softener
• Tumble dry low with dryer balls to restore loft
• Reapply DWR spray when water no longer beads on fabric

Who is this for? The Marmot Ajax Boys' Down Puffer in Cobalt Blue (Large) is designed for active kids who need dependable insulation in cold, occasionally wet conditions. It suits families who want a lightweight, packable winter jacket that balances warmth, mobility, and everyday durability for school, outdoor play, and travel.