MuleBar have just sent us five of these tasty looking Christmas stockings, stuffed with energy bars and gels, to give to five lucky readers.

The stocking is packed with four gels, one MuleBar, one ReFuel protein bar and two MegaBites. They cost £9.99, but if you get the answer to the question below right you stand a chance to win one completely free.

All you need to do is answer the following question (and if you need a hint, there’s a clue on this webpage):

Q. Which MuleBars are sold with compostable wrappers in 2011?

You can either post your answers in the comments box below or the forum thread here.

The closing date is Wednesday 14th December at 4pm. Winners will be announced shortly after.