This is another great product from Ruff Rider called the Ruff Grip.
It was invented by the same guy who invented the rough caps and it has the same general idea.
If you are too busy to play your instrument except on weekends, you can carry this little tool around and keep your fingers tough and your callouses strong so that you won't miss a beat because your callouses aren't thick enough.
They come in pink, black, blue, purple, red and green. If you have a color (that's "colour" for Canadians and Brits) preference let me know and I'll do my best but I reserve the right to make a substitution.
I carry mine around with me everywhere. I can't play everyday but when I do play, my fingers are always ready. Try them- you'll wonder how you ever went without!