whats the diff between prolite and prolite plus?
also is reg size -- which is only 20in wide enough room or should i get the large (25" wide)? (5'5" 140pd woman)? -- the women's one seems too short at only 66" long. too many choices!

If you plan on using your pad for winter use or simply want a more comfortable night's sleep, choose the ProLite Plus. It gives you an extra .5" thickness & increases the R-Value rating from 2.2 to 3.8.

There are some significant differences between the two pads. The Prolite was designed purely for weight and size conscious users. It is 1/2 lb lighter than the Prolite Plus. The shape is different (rounded corners, super lightweight materials top and bottom, star cutouts, etc.). As was already mentioned it is only 1" thick so there is a compromise on comfort (although with a self-inflatable mattress you do have the ability to make it as firm as you want thus allowing a 1" pad to be quite comfortable). The Prolite Plus is for the user who wants lightweight and compactness, but doesn't consider these it's most important features. The Prolite Plus is meant for all-year use based on the holes being cut out at a 45 degree angle which gives it more insulation (more R-Value) but still maintaining the weight and roll up size of the Prolite 4 (brand new feature for 2009). It's the best lightweight option for 4 season use. Because it's 1 1/2" thick, it's also more comfortable. Again, it is 1/2 lb heavier than the Prolite. The women's versions of both pads have a chevron pattern in the torso and feet cutouts. This gives them both more insulation and a bit more comfort (this was due to the belief that women are typically colder sleepers than men). They are the same size and weight as both men's versions when rolled up which is achieved by shortening the women's pads about 6 inches. I think the regular size is a perfect fit for you in my opinion. You will appreciate carrying less pad and it is the exact length that you want. Having it be a little wider is desirable, but not necessary. However, only you are an expert in how you sleep so I would get what will make you the most comfortable. Even the Lg sizes roll up small and don't weigh that much. Personally I go with the lightest weight I can get away with. This seems to make a huge difference over the course of a week of backpacking. Just some thoughts...

The plus is .5" thicker, weighs a bit more and is considered a four-season pad, while the prolite is a three-season pad. I use a 20" pad and it's wide enough for my average frame. It depends on how much weight you want to carry. If you think you roll around a lot, you may want a wider pad, but its not really necessary. I'd say go for the regular size.