Not the Garmin straps, in my experience.

In cold weather, especially early in the ride, both my older (plastic) and newer (cloth) Garmin heart rate straps often show crazy high HR spikes. Just warming up I'll see 200+ bpm. It's not so. I've tried the HR gel, water, saliva, etc., and I've tried different shirts. I haven't found any way to reliably avoid the spikes. I haven't had the problem yet this fall. Our temperatures have been 45°+F so far.

I'm satisfied with them in general. But as it gets cold I'll have to edit on the HR spikes on many rides.