Very good idea with mesh material - is light and easy in handling (when dry). However, 15 m long sock is for a big spinnaker (125-150 m2), but the circumference in lower parts is rather small. So, when the spinnaker is wet handling becomes very difficult. There is simply not enough space in the sock and during lifting spinnaker cannot slip the sock and follows it up (very annoying!). Another problem is lifting line which is outside the socket. This 15 m long line easily makes knots and loops around the sail when its down on the deck. What I have done is I placed the lifting line inside from the top and made an opening 3 m from the bell, so now I have only 4-5 m of the line outside when the sock is down.