>>608769Winter conditions, yes... very much.
Hiking, no. Outside of setting up to take photos, anyways. I like engines.
How much snow are we talking here? A few inches/cm, or 10ft/3m+? What elevations?
Don't do it solo till you know you can do it and you're comfortable with it. Take a friend, or go with a group (Good idea in the winter anyways).
If you're in avalanche terrain, educate yourself (and the people you ride with) and carry rescue gear (beacon/shovel/probe).
Pack like you're going to stay the night.
Firestarting tools you're proficient with.
Flashlight, helmet/headlamp. Spare batteries.
Some form of shelter (Plastic trash bags are cheap and lightweight, can be used many ways including a wind break).
Snacks, water (Aluminum avalanche shovel, snow, and a fire can make water too).
Gloves, and extra pairs of gloves.
Good gear (Boots, pants, jacket). I wear a helmet/balaclava, not sure what'd work best for hiking/nonmotorized, but you'll want something that covers your head/face.
Eye protection is largely up to you, most of the time I wear goggles, but I pack a pair of sunglasses for when we stop. On nicer days I'll just wear those and stash the goggles under the hood of my sled.
SUNSCREEN.
On the topic of clothing... dress in layers. I'd MUCH rather have more thinner layers than one really heavy/warm jacket.
My base layer is a moisture-wicking jersey, protective vest over that, and a waterproof/windproof goretex shell on the outside. On the really cold days I'll wear another thermal layer under my jersey and cinch down my armor to keep the heat in.
Everything else I can think of is motorized-specific, but ... that's kind of my thing.