I have a limited stock of wetsuits that can be borrowed for canyoning or any water-based trips that I lead.
They should fit ~70% of people going on beginner canyoning trips. If your size is XL or S, I may unfortunately not have stock for those. I recommend having your own wetsuit if you're going on 3+ canyoning trips or going on intermediate canyons- more info on this page.
Wetsuits are a tight fit- not too tight, of course. If it's too small to even put them on, then it's too small. Most wetsuit sizes are very similar to the sizing of T-shirts- if you normally wear a L T-shirt, then a L size will fit you.
Thickness recommendation:
2-3mm: Beginner canyons in warm summer day, eg. Empress, Gobsmacker, Grand
3-4mm: All canyons in warm summer day
4-5mm: All canyons in cold days or shoulder season
Some people get colder than others, and the info above is a conservative recommendation. You can get away with thinner wetsuit if you tend to stay really warm or overheat yourself, but you should go with something thicker if you tend to get cold in canyons.
Size claimed by manufacturer: M
Should fit: M-L
Length (Shoulder to ankle): 153cm
Waist width: 50
Thickness: 3mm core, 2mm extremities
Size claimed by manufacturer: L
Should fit: M-L
Length (Shoulder to ankle): 140cm
Waist width: 56
Thickness: 2mm