Question 1

Is the Mac in a Sac Ultralite jacket actually waterproof?

Accepted Answer

Yes. The Ultralite uses a 2.5-layer construction with fully taped seams and a waterproof rating of 10,000mm — enough to handle sustained rain and wind. It's not a heavy-duty mountaineering shell, but for trail running, road running, and hiking in typical UK weather, it delivers solid waterproof protection.

Question 2

How does the Mac in a Sac Ultralite jacket fit?

Accepted Answer

The Ultralite is designed to be close fitting. It's built for running rather than casual wear, so it sits neatly against the body and layers comfortably under a hydration vest. Most reviewers find it true to size, though some go up a size if they prefer a bit more room. The stretch fabric gives you freedom of movement even in a slim fit.

Question 3

Can you wear the Mac in a Sac Ultralite for hiking as well as running?

Accepted Answer

Absolutely. While it's designed with runners in mind, its packability, breathability, and windproof construction make it equally useful for fast-paced hiking, fastpacking, and cycling. It stuffs into its own pocket in seconds, so it's easy to carry as a just-in-case layer on any day out.

Question 4

How does the Mac in a Sac Ultralite compare to other lightweight running jackets?

Accepted Answer

At £74.99 and 240g, the Ultralite is competitively priced for a fully seam-sealed waterproof jacket with this breathability rating. It lacks the stowaway hood of some rivals, and the colour range is still fairly limited, but it delivers on the core performance criteria — and the stretch fabric gives it a more athletic feel than a lot of packable waterproofs at this price.

Question 5

Does the Mac in a Sac Ultralite hood pack away?

Accepted Answer

No — the hood stays out when not in use. This is a genuine limitation compared to some jackets that allow you to roll or stow the hood away into the collar. In practice, when you're running it's not a major issue, but it's worth knowing before you buy.

Month: March 2025

Mac in a Sac Ultralite Running Jacket – Trail Tested Review (2026)

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