Our 10cm SIM's finally died on us during lockdown and we invested in a pair of Berghaus double SIM's when they were recently reduced in the GoOutdoors sale.
Just opening one out now and there are no instructions - fine I thought, I've had a few of these before.
Nope. Need the instructions! I've unrolled them and the valve is a bit of a puzzle - has a removable disc that I'm unsure of. YouTube isn't helpful neither.
Does anyone have one?! Help!