There are few "slip-on" recoil pad that are particularly easy to slip on, don't look garish to a great degree, stay in place, and work well. The Limbsaver Slip-On Recoil Pad, by Sims technologies, is all of the above. It is stretchy enough to easily install, and keeps enough tension on your buttstock to stay in place.
Unlike the Velcro types, it is not baggy or saggy, and had no odd protrusions that can snag either your jacket or offend the eye. Also, I've found the "Navcom" (Noise and Vibration Control Material) to be non-marking, though Limbsaver suggests that these pads be removed when the gun is not used for extended periods of time. Most importantly, the Sims Limbsaver slip-on recoil pad really works.
I tested the medium size slip-on Limbsaver on three different rifles, and it did splendidly. It is an ideal approach if you need to add a little extra length to your buttstock, or want to soak up recoil without affecting the value of your Browning Superposed or Winchester Model 70.