You will certainly find compression clothing to be of a big advantage in the hills, be it shorts or leggings.
Many of us here would feel self conscious or lacking the confidence to wear them in the hills, but you can wear them under your clothing, and they still retain their compression.
Take my word for it, they do elevate muscle tiredness over long periods, and actually support the calf muscles and leg muscles in general.
Skins, Under Armour and even Nike make their own versions.
Sports direct have them at very sensible prices of around £25 for the full leggings, or £12 for the shorts, so they do not have to be expensive.
Skins are probably the best quality ones on the market, and can be bought for well below retail price if you look carefully.
Sports Direct have been selling them for some time, and seem to sell them considerably under retail price.
Its an item of clothing that once you get used to, you will find it helps retaining heat in the lower half of the body, which in colder weather is a big bonus, and they almost combat muscle tiredness over long periods.
I certainly notice a difference if i had walked a significant distance without wearing them, but its a bit of kit no doubt many of us could get along fine without
The thing i like about the full length leggins, is that even when totally saturated in water, they retain their warmth and compression properties.
Its an item of clothing that does actually work, so the claims are not without substance, but it really depends on your body shape.
If your legs are not of the athletic type or build, then you may struggle to get into the leggings, but the shorts would be the best solution if your carrying unnecessary weight.
Give them a go, and you may become a convert.