Bike seats, or saddles have a huge impact on your comfort whilst riding. The most important feature is the width of the saddle, it should just cover the width of your sit bones, no preferably no larger. This is not dependant on body weight as often thought. The type of riding that you do will then dictate the shape of the saddle, the more aggressive position, the narrower the nose of the saddle needs to be to ensure your thighs don't chaff against the saddle. Cushioning is usually comfortable for short rides, however the more often you ride, generally you will find less cushioning more desirable.