Levys Comfort Series 3,25" BK

It is a very good quality strap with just a couple of problems:
It is too elastic. That makes the length setting somewhat of a mission. Particularly for concerts where you move a lot, it can make your guitar bounce and affect your playing.
Another problem: sweat. It gets quite warm on your shoulder, and it absorbs sweat. I contacted Levys about how to clean the strap, and this is their response:
"Mild detergent may be used, however make sure you rinse the pieces properly. Hand-wash your item just as you would delicate clothing. Wash gently, squeeze out the dirty water, and allow it to soak a little while longer. If the neoprene is especially dirty or grimy, you may want to soak it overnight."

Levys customer service was quick, cordial, and useful, a big plus for that.