There is an ever-widening choice of footwear for fell running, including the traditional 10mm stud of a classic Walsh PB - the original fell running shoe developed by runners in the Lake District. The newer Inov-8 and Salomon models like the Mudclaw300 and Mudclaw 265 or Salomon Fellraiser are great for training and racing. Then there are the Cheap salomon lighter weight and very flexible X-talon 212 and X-talon 190, which are basically racing flats with studs and designed to go. They are all designed to offer excellent traction on steep and/or rough terrain, but differ slightly in fit and feel.
Deeper studs are better in very wet or muddy conditions, whilst a less aggressive sole will be more comfortable on mixed terrain or for Cheap salomon shoes dry summer hill running (see also Trail Running Shoes). Another technical point to look out for is or softer rubber outsoles, which give good traction on wet rock.
There are also fell/cross country options for "little feet" such as the junior Inov-8 X-Talon 160 which is available from size 1-5 UK. Cushioning & Grip
Fell shoes were originally designed primarily for racing. Cushioning is salomon shoes usually minimal to keep the foot close to the ground and reduce unnecessary weight. Having said that they are also used by runners in long distance 2 day Mountain Marathons and 24-hour expeditions, like the classic Lakeland "Bob Graham Round".
As with racing flats for road running, salomon trail running shoes not everyone can handle long distances in a light shoe. Your own experience in training and racing will guide you as to how far you can cover in a fell shoe, before you start looking at or comparing some lighter trail running shoes.
If you are running on a variety of surfaces, it is worth bearing in mind the salomon speedcross 3 conundrum that has faced off road runners for years. There is no one shoe that is totally brilliant on all terrains, and often a compromise has to be reached between cushioning and grip.