These pants are awesomeness! Very high quality and super nice. The airflow pocket lets in a lot of air when open and is nicely sealed when shut. I am very particular and looked at 200 pairs of pants before deciding on these and I'm so glad I did. The only thing I was really concerned with was trying to prepare to get the proper size the first time.

Here was my goal. I wanted a pair that fit me properly with just boxer underneath but if I could fit it on over a pair of jeans too for when I ride to work, that would be awesome. I accomplished this goal but the pants are hot in 80 degrees weather with jeans under, boots on, jacket, and gloves. I like the option for fall riding though. So, with regards to size, I got a little bit bigger size than the chart said and glad I did since I feel the pants are smaller than they say. I am 6'-1" man and I wear 34"x32" jeans. I would be considered skinny fat lol. I'm pretty thin but have a belly going that normally hangs over me jeans some but the 34" waste isn't really tight. I didn't have a clothing measuring tape so I improvised. I used a piece of string and then laid the string flat on a table and measured it. These are the results.
Hip 36 to 36.5
Waist 38 at belly button (being relaxed with it pushed out but I can easily suck it in, more like 36.5 to 37)
Inseam 32
Thigh 23.5
I was worried about the belly since these pants sit higher on the belly than jeans. I got the XL pants and they are perfect. I can fit over my jeans but I only did that one day because it was super hot. I have the pants adjusted to almost the tightest but I could make them tighter if I lose some belly fat. They fit perfectly. The knee pads feel good and I love how they are CE Level 2. I wish the hip pads were too but they have a direct replacement Alpinestars Nucleon Racing KR-HR Hip Protectors.

These pants are really nice quality and I think anyone would love them. Zipper and clasp and button made high quality. Style looks cool too. I got the pair with the red and white stripe. Hope my review helps you. These pants had just come out when I bought them and there was no reviews so I actually spent the time to review this for you to help you. Give it a like if it helped. Ride safe.

The pants are nice. I'll start with that. The knee nucleon armor is amazing. I've also swapped them into my riding jeans as well because they're superior to what came in those pants.

I'd recommend getting the velcro hip armor as well. Crashed in those and I still got a bruise but I feel that it would have been much worse had I not put in the hip armor.

As far as crash protection goes....

I low sided going around 25-30mph. Nothing crazy fast or extravagant. The knee armor doesn't quite sit right no matter how much adjusting I did. It just kind of floats around in the pocket and wasn't securely on my knee when I crashed.

The pants themselves shredded through at the knees as well. I have two holes at the knees and a little bit of road rash from the crash.

Funny enough, I slid a bit on my hip, too, and that held up just fine. I wouldn't say they flow a crazy amount of air and the black finish cooks you in the hot sun if you live in a warmer climate.

I liked these pants but they did not hold up well in a lowside.

Well constructed, quality materials from a well respected manufacturer. Fit & finish out of the box were excellent, what I expect from Alpinestars.
Fit was perfect for me, though had to call sales to clarify how to order. The "select a size" field has small, med, large etc, but the size chart is in Euro/Alpha, which doesn't map directly to the size selection.
Got a medium and it was right on (5'7", 155lbs, jean size 32"/30".
Upgraded the hip protectors and glad I did; much better protection and they fit perfect.
Knee armor a bit low when I stand but good coverage in riding position.
Today was first warm riding day so I could test the "Ramjet" ventilation, sort of a disappointment. I was looking for pants with convertible mesh panels or vents for Spring/Fall riding plus hot Va. Summers. The zip open panel on these pants are on the upper thigh, so they're not in direct airflow when riding, plus they're small barely 1/2 the size of my upper thigh. The panel material is obviously robust, but conversely doesn't flow much air. In my case could only feel it when there were some pretty strong cross drafts.
Conclusion : great, light weight pants for commuting or even touring but if you need more air flow, should probably get full mesh with removable wind breaker.
Protection appears to be good (though haven't tested that yet!); durability is unknown as they're brand new.

First, I am 6' 165lbs 34 in jeans. I bought a size 34 and they fit true. I love the length. I can wear them inside or outside my boots. If they are outside the boots, they are not flapping around but are not tight enough to be uncomfortable. The protection is adjustable and seems to stay put on the bike. The hip protectors will require an upgrade to satisfy me. They do have pockets which are very useful. The airflow is great. Soooo much better than a pair of jeans and a must have for summer riding...especially here in the south.

I'm 36 around the waist and 32 down to the ankles and the XL fits quite well around the waist. The style, build, and nearly every aspect of the pant is more than enough to make me happy except the knee armor placement. It's assumed that the larger the pant size, the longer the legs. When I stand, the knee armor slides all the way down and becomes shin armor leaving my knees completely unprotected. When examining the pocket the armor fits in, there is a way to adjust them up or down but only around an inch or two. If the armor were to fit snug on my knees, this product would be amazing. But instead, I'm almost finding myself not wanting to wear them at all.

5' 11" male weighing 170lbs. Slender build. The Medium pair of pants fit very well with just enough room left to fit over a pair of jeans. A touch on the tight side but not uncomfortably so for use while riding.

The first couple of rides in them on hot summer days were definitely an improvement over a pair of 4-season riding pants that I normally wear. This feeling was reinforced on a cold morning riding where a definite breeze was felt through the mesh lower portion of the pants.

For features, these pants are rather simple which isn't a bad thing, a lot of mesh for the liner and a few flaps you can open in the thighs to help let everything breathe a bit. The knee pads are also adjustable vertically to achieve the proper fit while riding.

Unfortunately, I will not be able to provide a long-term report as I had to lay the bike down while avoiding a truck backing up. The good news is, however, that these pants did their job and protected me from injury with the stock kneepads doing their job and the pants material holding up long enough for me to come to a stop. Unfortunately in the process, the pants were ruined and I will need to get another pair but they did their job and kept me safe and that's all you can really ask for.

I would highly recommend these pants to anyone else looking for a pair of riding pants that are comfortable, protective, and don't scream touring or adventure riding.

Sizing:
I am a bit on the shorter side at 5'7. I purchased a small and when it arrived, I was disappointed on how large it was. However, after fiddling around with it, I am glad that I got these. The waist adjustment was extremely useful as I was able to pull the pants up to my belly button area and tighten it. Not only did this solved the length issue and the waist issue, I still have a good amount of space for the crotch area so its not pulling up against it.

Air flow:
I've tried these pants with and without boots (SMX 5) on. Since there is a large mesh area on the shin, a lot of air flows through. With the boots on, the air flow was still not bad. The boot stops a few inches before my knee, so with the extra mesh, air is still able to flow and keep me cool, just not as much without boots on. As for the thigh panels, it doesn't help much. You only get 3/4 - 1/2 amount of air since the flap is supposed to be folded in. Also because of the riding position, your thigh isn't impacted by air as much as your shin is.

All in all, I would recommend these pants!

I bought these basically looking for something with knee armor that would look decent and flow some air. I am not disappointed! I'm 5'7 and 175 lbs and I fit very well in a medium. They are not too long which is usually an issue for me. The ramjet vent bits are ok, they don't inflate the pants with cool air or anything but there is a substantial difference with them open or closed. Like with any vented gear, you really only find out how well it works when it starts to get cold. The lower leg zips make it quick and easy to get over tall boots too. I haven't crashed them yet, but with the knee and upgraded hip armor, I'm sure I'd fare better in these than in jeans. Solid pair of pants.

These are very nicely made pants. I wear 32x34 jeans and the large fits me perfectly. I would like to be able to move the knee armor a little bit higher but they do not seem to be adjustable. Other than that small complaint I am very happy with the product and would recommend them.

I wear these pants 2-3 a week on my Harley as well as a duel sport. look great, feel great.