Not sure on that one Tom as i've only completed the Airtime Jersey tech course, the Pants tech course is next month, with a whole morning on zipper dynamics.
For the hard of thinking: Wool Cycle (noun) The length of time that elapses between a lambs birth and it's first shearing, usually about 14 months. Similarly the period of time that elapses before single male ballers realise the need to wash their kit.