I purchased the LIG 4.0 jacket/pants combination. While the jacket is good, I had some problems with fitment with both the M and L. It is unfortunate, but does not matter as there are many other synthetic jacket options that fit me very well. Had Carinthia made Regular/Long sizes this would not be an issue, I am not particularly irregularly sized at 184cm and 80kgs.
Regardless, the trousers in this set I absolutely recommend, they are not too many options when it comes to good synthetic insulated trousers. I really appreciate the belt loops and draw cord adjustments most other options only include one and not both. These adjustments really provide one with versatility in how one wants to wear them. The cut of trousers is also done rather well, they can be both worn over or under one's pants and the articulated knees makes them such that they are easier to move in without the extra bulk. Furthermore, the re-enforced material used to tighten the fitment of the pants at the ankle is a nice touch and having the choice of the velcro and snap buttons is convenient too. From the several insulated pants I have looked at, these seem to be the most versatile and best designed, by far. These are great for layering in a clothing system or for increasing the warmth of a sleeping system. I am very happy with this purchase.
Excellent ease of use and weight/warmth ratio.
Usually wearing L but could likely have fitted M too. XL person fitted L nicely. At the same time tightening system works well too and there is no real need to go a size down. If you get the jacket, get the trousers too.