The Layering System Explained
Effective winter dressing uses three layers. The base layer wicks moisture away from your skin. The mid-layer traps warm air. The outer shell blocks wind and rain. Each layer in the OSSBuy Spreadsheet is tagged with its function so you can build a complete system without guesswork.
The base layer is usually a thin long-sleeve thermal or a merino blend tee. The mid-layer can be a fleece, a hoodie, or a lightweight down liner. The shell is a parka, a windbreaker, or a technical hardshell depending on your local climate.
Measurement Reference
Sleeve: shoulder seam to wrist bone
Best Base Layers in the Spreadsheet
For base layers, look for synthetic blends or merino wool. Merino is odor-resistant and regulates temperature better than cotton, but it costs more. The synthetic thermal tops in our spreadsheet use a brushed interior that feels soft against the skin and dries quickly after washing. They are the best budget option at under eighty yuan per piece.
Buy two or three base layers in rotation. They are the piece you wear closest to your body and therefore need the most frequent washing. Having spares extends the life of each one.
Fabric Reference
Mid-Layers and Shells for Every Climate
If you live in a wet climate, prioritize a waterproof shell over a down jacket. The technical hardshells in our list use a three-layer laminate with sealed seams. They are lighter and more packable than traditional raincoats. For dry cold climates, a down parka is unbeatable. The spreadsheet lists fill power and fill weight so you can compare warmth directly.
A pro layering trick is to size up your shell slightly so it fits over your mid-layer without compressing the insulation. Compressed insulation loses loft and therefore warmth. Check the spreadsheet's fit notes column for guidance on sizing up.
