One of the biggest differences in the variety of baggy bike shorts is the thickness and quality of the chamois pad or crotch liner. There are lots of differrent thicknesses and densities of chamois pads. The chamois padding is sewn into a liner inside the baggy outer short. It is real important that the liner material be as stretchy and light as possible so that it is cool to wear in the heat of summer when you are most likely to be outside using the garment. Most padded underliners are made of a wicking stretch polyester that stays dry and airy under the outer layer.
The location of pockets on a pair of Mountain bike shorts is an important consideration. There are lots of different opinions on where is the best location. Some people view their legs as engines and don't want anything moving in their pockets while cycling. Other people want lots of pockets with zippers so they can carry everything they need accessable within a quick zip. Most road shorts do not have pockets, so if you need pockets you may want to consider a baggy MTB short. The variety of men's mountain bike shorts shown below represents a great variety of options for everyone who rides.
The fit of a baggy short is important because we all have a preference or two on the way our biking shorts should fit. Men's mountain bike shorts run true to size. They are loose fitting. Some people want a shorter inseam on the legs for coolness and air. Others need a longer inseam for protecting the legs from sun, briar bushes and branches. Most all MTB shorts have a stretch elastic waist with a drawstring which is essential to adjust the fit in any pair of baggy shorts.Reflective elements like piping, zippers and tabs enhance safety and visibility if you ride at night. Look for a bit of reflectivity that can alert automobiles that you are riding nearby. This is important to add visibility in low light conditions.
One important note about mountain biking is - the feet are often wet during rides through mud. A key element to comfortable biking is great socks.Mountain Bikers get really dirty with caked mud and grime, so Black Coolmax Socks or other types of wicking socks that can easily be washed and are essential to mountain bikers.