The Arc'teryx Atom Hoody Men's, especially in the Black Sapphire version, has a pretty versatile fit, which is why it's a hit with lots of outdoor folks. Now, when it comes to sizing, most folks find that it fits true to size. But, you might want to keep a couple of things in mind to make sure it suits your comfort and style.

From what we've found, the jacket generally fits as expected, but if you're thinking about layering up for chillier days, you might consider going a size up. For instance, there's someone who's 5'11" and 150 lbs who thought the medium fit perfectly, but suggested sizing up if you like a more relaxed fit or plan on wearing heavier layers underneath.

According to the manufacturer's description, a medium is geared for a 40-inch chest and a 34-inch waist, which can give you a good comparison with your own measurements.

Our data shows that people really appreciate the jacket for its synthetic insulation, which keeps you warm even when things get damp, and for its lightweight yet durable build. It's made with really solid materials like the Tyono 20 denier shell and Coreloft 60 insulation.

That said, opinions vary on the fabric's feel and the updated fit, particularly in the chest and hip areas. So, if those spots are a concern, thinking about a size adjustment could be worth it.

Overall, if you prefer a snug fit with some room for light layering, your usual size should work fine. But if you're aiming for more ease and layering flexibility, going up a size might be more comfortable without losing the jacket's great performance.

The Arc'teryx Atom Hoody Men's jacket isn't really meant to be fully waterproof.

It's more about being water-resistant, which can handle a light sprinkle or some damp weather. From what the manufacturer says, the jacket's materials can deal with a bit of moisture, making it handy for outdoor activities when there's a chance of light rain. But for heavier rain, you'd probably want to add a waterproof layer on top to keep dry.

The jacket is more focused on insulation and being versatile. It uses synthetic insulation to help keep you warm, even if it gets a little wet, which is nice for those unexpected weather changes.

About the fit and feel—our research shows some changes in the latest version compared to the older ones. The new fabric is seen as less soft and a bit crinkly by some. It's not a dealbreaker for everyone, but a few folks mentioned it affecting their buying choice.

In terms of size, the newer Atom Hoody seems to have a boxier shape and might run smaller than expected. If you're worried about fit, consider going a size up for comfort.

The hood design has also been updated; it's looser than before. If you like a snug fit, especially when it's windy, this might be something to keep in mind.

If details like fabric texture and fit are important to you, you might want to check out previous versions or other models to find what suits you best.

But overall, the Atom Hoody is still a go-to for its warmth and versatility in different conditions.

The Arc'teryx Atom Hoody Men's uses Coreloft™ 60 insulation, which is pretty good at keeping you warm, even if it gets a bit wet. That's super handy for those days when the weather can't seem to make up its mind.

What's nice about Coreloft™ is that it dries quickly, so you won't feel damp for long. Plus, it's got a bit of an eco-friendly angle, as the insulation includes recycled materials, which is a bonus if sustainability's on your mind.

From what we've gathered from our research, this hoody does a solid job of keeping you warm without weighing you down, unlike some bulkier down jackets. That's especially great if you're doing stuff like hiking or backpacking where being nimble is important.

People who've tried it generally say it hits a sweet spot between warmth and lightness. Sure, it might not be as toasty as thicker down jackets, but it's impressive for how lightweight it is.

Some folks have mentioned that it keeps them cozy on chilly days, but a few also noted that it can fit a bit snug. If layering is your thing, you might want to consider going a size up for added comfort and warmth on really cold days.

Overall, the Atom Hoody has a good rep for being versatile and high-performing. Its innovative insulation and design make it a solid choice for different outdoor adventures.

It really nails that balance between keeping you warm and staying lightweight, according to various reviews and feedback.