http://www.performancebike.com/bikes/Sub…
Some have padding, some don’t.
Just do a search for Mountain Bike Shorts.

Running shorts are made from materials which will be comfortable worn by an exercising human. They are designed to be lightweight, hard wearing, carry sweat away from the body and not to rub against the skin. Many shorts have an inner lining to act as underwear.check socksRunning shorts generally have a seam cut up the side of each leg to permit easier running movement. The main variation in the type of short is the length of this seam. The names used to describe the different types indicate the length of the leg which is not cut, so for example a 3/4 seam means there is 1/4 cut.

The disadvantage of the longer legged shorts is that the material extending down the leg is pulled up the leg, by the motion of the stride, upon every stride. If the material is in any way catching or tight, this is an uncomfortable encumberance.

When a person who goes on a bike tour dresses for weather conditions that are not likely to change in the course of a single day, it is not to difficult to choose proper clothes, but what would happen if you were on a more extended cycling expedition? Then, you should definitely know something about the way layered cycling jerseys help you protect the body in both cold and hot weather. With the modern technological advantages, bikers no longer have to wear too thick clothes that hinder movement and cause discomfort. Made of very soft and light fabric, bike  jerseys ensure a good air flow that leads to the elimination of moisture.

Experts in the field claim that the bike jerseys that are worn directly on the skin absorb sweat and spread it evenly on their entire surface; unlike some other materials that accumulate and retain humidity, the synthetic compounds of modern tops allow immediate evaporation. For the base layering, short sleeved bike jerseys are highly recommended, with easy to use zippers and anatomic shapes. Wool cycling jerseys used to be worn in the past as part of the mid-thermal layer, the one responsible for the preservation of the body warmth. Fleece materials have assumed this role in recent years as they don’t allow any exchange from the exterior to the interior.