Reddit mentions of Sunlite Thorn Resistant Presta Valve Tubes, Multiple Sizes

New England here:

Bike: Dedicated winter bike with sealed cables, 32h box-section wheels with 28c tires. Staying on top of bike maintenance is super important because stopping for a mechanical can be downright dangerous if you're riding in remote areas.

Some people I know ride with thorn-proof tubes in the winter because they want a nearly zero percent chance of flats. They are really heavy!

https://www.amazon.com/Sunlite-Thorn-Resistant-Presta-Valve/dp/B00QU9C1O8

Dress: This is person-specific. Obviously layering is key.

More key is having more zippered layers up top so you can unzip when going uphill. Keeping sweating minimal is the goal. Sometimes it's unavoidable. On a recent 5 hour ride, I carried an extra thermal baselayer and pair of socks to change at a midway stop. 10/10 - would recommend.

Also key are chemical handwarmers on top of your shoe, underneath the shoe cover (I have a set of zipperless neoprene booties that are the most durable set I've owned.)

As nerdy as they are, I use Bar Mitts when it gets below freezing. I've been able to use very light gloves with them, which provides much more dexterity for shifting or grabbing food than heavy gloves.

Bonus pro-tip: Don't forget about hydration when out in the cold! It's really important for staying warm.