If just stretched you can tighten it up by tightening the lashings, if room, or simply pulling the excess net into the bolt
rope and lashing it with a series of overhand knots. Do this on opposing sides and you’ll have a tight net again. But that’s only worth doing if your net is in good condition otherwise.
We just replaced the trampolines on our cat, though it isn’t a
Lagoon, which we think were original at 14 years. The old netting was stretched and strands were starting to break. Seriously scary.
If you do a web search for after market trampoline providers such as
https://multihullnets.com/ you’ll get an idea of the range of materials and finishes that are available. The basic factors are comfort vs openness, then appearance, cost and strength. Lagoon should be able to tell you what the minimum openness is for your trampolines. We initially wanted a webbing net for comfort but quickly realised that it wasn’t nearly open enough for our
boat.
Especially if you’re going
offshore, but maybe that could be the next trampoline after this one, you will appreciate having a trampoline that easily sheds
water and doesn’t catch the
wind as you go over a wave. But for coastal sailing you can have a less open trampoline that will be more comfortable to walk, sit and lie on. I would think that replacing trampolines every 10 years or so is reasonable.
Our trampolines are relatively large, so windage is a big factor. We’ve ended up with a polyester 22mm woven net, which has reasonable comfort (if we’re lying on it for a longer period of time a towel or cushion keeps the net from imprinting on the skin), good long term strength and the required openness.