Insulated coveralls: the leg zip decides whether you wear them

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Research. We have not had a set of these through a winter here yet. What follows is how bibs and coveralls differ in use, which spec numbers mean what, and what washing does to them. When ours have been in service long enough to say more, this page gets updated with the date.

The insulated coverall you own is worth nothing next to the one you will actually put on, and those are usually not the same garment.

Bibs or a one-piece

A one-piece is warmer. No gap at the waist, no wind getting in when you bend over, and it is the right answer for a long stretch outdoors in real cold.

It is also one thermal setting. When you warm up there is nowhere to go, and no quick way out of it. That includes using the bathroom, which is the real reason most one-piece coveralls end up on a hook.

Bibs keep your own jacket in the system. The top layer comes off when the sun does something and goes back on when it does not. That matters more on a small place than a big one. Nobody here goes out for four hours. You go out for twenty minutes, six times — water, feed, a walk down the fence with a tester in your pocket — and half of those start and end somewhere warm.

Bibs for most people. A one-piece if the work is one long block outside, or if you want the garment to keep everything underneath clean.

The leg zips decide whether you wear it

This is the detail that decides it, and it is buried in the spec list.

Full-length two-way leg zips mean you put the garment on over your boots. Anything less means you take your boots off first, in a mudroom, and then put them back on. A garment that costs you two boot removals gets worn a lot less than one that does not.

The common compromise is a knee-length zip, ten to twelve inches. That will not clear a muck boot. Check the stated length and whether it is two-way — two-way lets you vent from the ankle up without opening the leg entirely.

Look at the hardware too. Heavy brass zips survive mud and frost. Lightweight coil sliders bind, then fail, and a dead main zipper on a one-piece is the end of the garment, not a repair.

Two different weight numbers

Listings quote two numbers and people conflate them.

Shell weight in ounces per square yard — 8.5 oz, 10 oz, 12 oz duck. That is abrasion resistance. It is not warmth.

Insulation weight in grams per square metre — 100 g, 150 g, 200 g and up. That is warmth.

A 12 oz shell with 100 g of fill is a tough, moderately warm garment. A thin shell with 200 g is warm and will not last near barbed wire. Neither number tells you about the other.

Shell material is a separate decision. Cotton duck soaks, stays soaked, and is heavy. It is also quiet, abrades well, and does not melt. Polyester sheds water and dries fast, and melts. Anywhere near a burn pile, a welder or a torch, that difference matters. Nothing here is flame resistant unless the tag says FR.

Damp cold is a shell problem

Thirty-four degrees and raining takes heat out of you faster than ten degrees and dry. Wet insulation stops being insulation.

So in Tennessee the water resistance of the shell does more work than the grams of fill. A 150 g garment with a shell that has wetted through is colder than a 100 g garment that stayed dry. Buying up on fill while ignoring the shell gets it backwards.

Cuffs and ankles too. Elastic or snap gussets keep out chaff, sleet, and the water that runs down your arm into a tank.

Washing is the countdown

The water repellency is a surface treatment — DWR — and it is not permanent. Detergent residue kills it. Fabric softener kills it faster, and dryer sheets do the same.

You will wash these, because they will have mud and manure on them, so the treatment is on a countdown from the first wash. What extends it: plain unscented detergent or a technical wash, a second rinse, no softener, and warm tumble drying afterward, which reactivates what is left. When it stops beading, reproof with a wash-in or spray-on product. That is an ongoing cost nobody mentions at purchase.

One practical thing more. A wet insulated coverall is heavy enough to unbalance a household washer, so a lot of people end up at a laundromat with a big front-loader. A real trip, and a real cost.

What we are buying

Bibs. The article settles that on its own argument, and the argument fits a place this size. What it does not settle is the specific set, because the leg zip is the spec that decides whether a garment gets worn, and a zip length only means something measured against a particular boot — and the boots are not chosen either. So the order runs one way: boots first, then a zip that clears them. Buying fills this section in — the garment, the shell and fill weights, the zip length and whether it is two-way, the reproofing product bought alongside it, what it all came to, and the date. None of that touches the tag above. Research stands until a winter of wet cold has been through the set, and until enough washes have gone by to say when it stopped beading.

Before you buy

• Try it on over the layers and the boots you will really wear. Size for that, not for your jacket size.
• Check the leg zip length and that it is two-way before anything else on the spec sheet.
• Buy the reproofing spray with the garment. You will need it before you think you will.

— Chris D., McEwen, Tennessee