Topic

Winter Down Jacket for Teens – how big can you go with insulation sizing ?

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PostedMay 6, 2025 at 5:12 pm

Hi,

Hopefully someone has some experience here. Looking to Invest in my daughter’s winter (Australian) down jacket for static time at camp in our alpine region, expected temps -5c to -10C.

As we hike in, vertical gains – 1500M+ usually this will be a stash in the bag, and pull out at camp jacket with layering, and part of an insurance system for sleeping. Her use case will accelerate this coming year, with many multi-day hikes and a one month hike next year in the winter snow.

To the question, how much room is too much room for a down jacket on a growing body?

Across chest, waist and hips, she’s undersized for Adult yet oversized for Children. We’re talking a circumference differential of about 7-11 inches, between jacket and body on an adult small – which looks like 1 to 1.5 inches of space without layering. I’m partially thinking maybe she’ll grow into an small adult sizing (no doubt) but also curious of the performance of insulation layers IF there is an oversized gap in fit of air (1-1.5cm), and how this can be effectively overcome.

Layering, is typically base, AD mid, Windshirt (then down under or over rain jacket) – this will eat into the space.

The jackets we’re looking into, generally have drawcords and hoods with cinches (think FF, Katabatic etc) so I’m guessing temp can be trapped. But I’ve never really had a jacket oversized, and wondering what a good approach maybe ?

Appreciate any thoughts,

PostedMay 9, 2025 at 3:43 pm

Thanks for the reply. Having looked through the link you sent & reviewing some Timmermade sizing comments…. We came to a similar conclusion. 5-10 inch circumference differential between body and measured shell of the jacket – is a bit of a sweet spot that preserves the down from being stretched or crushed, and we can eat into that space with layers (ie a vest). This would allow her growth, and preserve the power of the jacket – but that 5-10inch differential is the aim point.

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