Within Canada: This product ships directly from the manufacturer. Most orders ship within 2–3 business
days, although please allow up to one week for dispatch. Tracking information will be emailed once your order
ships.
To the USA: U.S. orders are transferred from the manufacturer to our main fulfillment warehouse, where
final U.S. shipping is handled by our team. This may add one to two additional weeks before dispatch. Tracking
information will be emailed once your order ships.
For hygienic purposes, please note that thermal undergarments are a final sale, and are not eligible for exchange or return.
Description
Heavy Weight Wool Onesie, Full Button Front, Made in Canada
Product Overview
Bend or reach in separate base layers and the gap at your waist lets cold through. The Stanfield's 1300 Heavy Weight Wool Union Suit covers neck to ankle in one 80/20 wool-nylon garment. A full button front opens for ventilation; the trap door allows bathroom access without removing layers. Forestry crews, commercial fishers, and utility workers count on this one piece thermal underwear for warmth.
Key Features
- Trap door, one-button flap seat, full rear coverage. The rear flap opens for bathroom access without removing the garment or stripping off outer layers. This trap door union suit stays on under coveralls, bibs, or FR shells.
- Full button front, adjustable ventilation. Unbutton during high-exertion tasks to vent heat; close up when stationary in below-zero conditions. No pullover restriction.
- 80% wool, 20% nylon, holds warmth when wet. Wool fibre retains insulating air even when damp from sweat or snow. The nylon adds abrasion resistance to high-wear areas.
- One-piece coverage, neck to ankle, no waist gap. This heavy weight wool onesie eliminates the exposed midsection that separate tops and bottoms leave when you bend, crouch, or reach.
- Shrink-to-fit sizing, arrives generously sized. Order your normal size. After the first wash, the wool combination underwear conforms to your frame and holds its shape through repeated washes.
- Made in Canada, Truro, Nova Scotia. Knitted in the same mill that has produced this Canadian made union suit since 1856. The mill has been knitting wool since the Klondike Gold Rush era.
Specifications
| Specification | Detail |
|---|---|
| Model | 1300 |
| SKU | 1300-551 |
| Garment Type | Union Suit (One-Piece Combination) |
| Fabric Content | 80% Wool / 20% Nylon |
| Weight Class | Heavy weight |
| Front Closure | Full button front |
| Rear Access | Trap door (one-button flap seat) |
| Colour | Grey Mixed |
| Sizes | S, M, L, XL, 2XL |
| Fit Note | Shrink-to-fit. Arrives oversized; conforms to body after first wash. Order normal size. |
| Country of Origin | Canada (Truro, Nova Scotia) |
| Manufacturer | Stanfield's Ltd. (est. 1856) |
| Care | Machine wash warm. Do not bleach. Tumble dry medium. |
Sizing & Care
This wool union suit arrives one size larger than the label. The oversized cut is intentional. One warm machine wash tightens the wool-nylon knit to a close fit that follows the shape of the body. Order your normal size and follow the care steps below.
Knowing how to wash a wool union suit without shrinking it beyond the intended fit starts with the manufacturer's care steps. Machine wash warm, do not bleach, and tumble dry on medium. The first wash produces the most shrinkage. After that, the wool combination underwear holds its shape through repeated cycles.
Prefer separates over a one-piece? The 1312 heavy weight wool long johns pair with the 1315 heavy weight wool henley for the same 80/20 wool-nylon coverage in two pieces. Both use the same shrink-to-fit process.
Applications
- Forestry crews and logging camp workers wearing this heavy weight wool onesie under insulated bibs for full-day bush operations in below-zero weather
- Municipal utility workers layering one piece thermal underwear under coveralls for stationary valve pit, meter pit, and hydrant maintenance shifts
- Commercial fishers and deckhands on open-water vessels who need a Canadian made union suit that holds warmth through spray and sweat
- Hunters, trappers, and ice fishers on multi-day cold-weather trips where bathroom access in a trap door union suit saves stripping off every layer
- Oil field and mining crews in remote northern camps where a wool union suit eliminates the waist gap that lets cold reach bare skin
Buy Stanfield's Wool Union Suit Online from Cleanflow
Cleanflow Utility Supply Company is an authorized Stanfield's supplier. Every Stanfield's wool union suit ships directly from the manufacturer, with tracking, across Canada and the United States. Qualifying orders over $199 receive free shipping.
Every Stanfield's wool union suit keeps you covered from neck to ankle with no waist gap, no riding up, and no bathroom hassle under coveralls. For sizing or product questions, email info@cleanflow.ca.
See the full Stanfield's wool lineup at Cleanflow for long johns, henleys, and every 80/20 wool base layer in the family.
Frequently Asked Questions
What is a wool union suit and how does the trap door work?
A wool union suit is a one-piece base layer covering neck to ankle, with no waist gap. The trap door is a rear flap that opens with one button for bathroom access. This style of wool combination underwear, often called a trap door union suit, dates to the 1800s.
What is the difference between a wool union suit and separate base layers?
Coverage. In a wool union suit vs separate base layers, the one piece thermal underwear eliminates the waist gap. Tops and bottoms ride up and expose skin when you bend. The 1312 long johns and 1315 henley use the same 80/20 wool if you prefer separates.
How do you wash a wool union suit without shrinking it too much?
Machine wash warm and tumble dry on medium. These are the manufacturer's care instructions for the 1300. Avoid hot water and high-heat dryer settings, which shrink wool past its intended fit. Do not bleach. The garment will shrink during the first wash as part of the shrink-to-fit process.
What is the best wool union suit for outdoor work in cold weather?
An 80/20 wool-nylon blend in a Canadian made union suit is the benchmark for outdoor cold. The 1300 uses 80% wool for wet-weather insulation and 20% nylon for abrasion resistance. Forestry, fishing, hunting, and utility crews rely on this as the best wool union suit for outdoor work.
What is the difference between a wool onesie and a merino one piece?
In a wool onesie vs merino one piece comparison, weight and durability are the differences. A Stanfield's wool union suit uses 80/20 wool-nylon for heavy-duty warmth. Merino options like the Smartwool Classic Thermal use 100% fine merino in a lighter knit. The 80/20 is heavier, warmer, and Canadian made.
Within Canada: This product ships directly from the manufacturer. Most orders ship within 2–3 business
days, although please allow up to one week for dispatch. Tracking information will be emailed once your order
ships.
To the USA: U.S. orders are transferred from the manufacturer to our main fulfillment warehouse, where
final U.S. shipping is handled by our team. This may add one to two additional weeks before dispatch. Tracking
information will be emailed once your order ships.
For hygienic purposes, please note that thermal undergarments are a final sale, and are not eligible for exchange or return.















