Refining Your Winter Cycling Mid-Layer Strategy: Merino vs Fleece Options & Their Versatility

When it comes to winter cycling mid-layers, not all fabrics are created equal. Two of the most effective NGNM mid-layer options are poly-merino blends as found in the Merino Jersey, and pure polyester/polyamide fleece used for the Primaloft Fleece Jersey. Both offer warmth and breathability, but each has unique properties that make them better suited for different riding conditions.

Let’s explore how these fabrics work, their key advantages, and how they can transition from a mid-layer to a top layer, depending on the conditions.

Fleece-Lined Poly-Merino Blend: The Best of Both Worlds

Thanks to its polyester-merino wool blend, the Poly-Merino Jersey combines the warmth, softness, and natural odor resistance of merino wool with synthetic fibers' moisture-wicking, quick-drying, and durability benefits. This makes it an ideal mid-layer winter cycling for insulation and breathability when temperatures are particularly low.

Why Choose a Poly-Merino Mid Layer?

• Temperature Regulation – Keeps you warm in cold conditions but won’t overheat thanks to Merino’s natural thermoregulating properties.
• Moisture Management – Wicks sweat efficiently while keeping you dry, unlike pure wool, which can absorb too much moisture.
•  Odor Resistance – Merino wool naturally fights bacteria, making this an excellent choice for multi-day cycling trips.
• Soft & Comfortable – The brushed fleece interior provides a cozy, non-itchy feel against the skin. Wear it when traveling or any day at home or at work

When to Wear It as a Mid-Layer?

❄️ Ideal for moderate to very cold conditions (0°C to 8°C / 32°F to 46°F).
❄️ Works well under any softshell (in extremely cold conditions) or autumn-winter jacket for added insulation like the Mid-Season Jacket.
❄️ Great for long endurance rides where temperature regulation is key.
❄️ Fantastic as a lifestyle jersey/sweater for traveling or running errands.

When to Wear It as a Top Layer?

•  If the temperature is cool but not freezing (8°C to 12°C / 46°F to 54°F), a poly-merino fleece-lined jersey can be used as a standalone outer layer with the help of an Air Gilet.
• Three convenient pockets at the back to store your essentials.
•  If you’re riding at a steady pace without strong winds, it can provide just enough warmth without needing a jacket or gilet.
•  Perfect for gravel rides where wind resistance is less of a factor, but breathability is crucial.
• Hiking, trekking, or any outdoor activity

Best Use: The Poly-Merino Jersey is an excellent choice for a warm natural feel with high-performance tech.

Polyamide Fleece: Lightweight & Performance-Driven

The Primaloft Fleece Jersey is a synthetic fleece mid-layer engineered for high-intensity winter riding. It excels in moisture-wicking, lightweight warmth, and durability. It offers an open back in a lighter brushed fleece fabric and 3 convenient pockets to store your valuables, especially when worn stand-alone or with just a simple gilet.

Why Choose a Polyester/Polyamide Fleece Mid Layer?

• Superior Moisture Control – Polyester fibers don’t absorb sweat but transport it outward, making this the best option for intense rides.
• Faster-Drying – Unlike wool-based fabrics, synthetic fleece dries incredibly fast, keeping you from getting cold after sweating.
• Shape Retention – Synthetics hold their form better than merino over time and are less prone to pilling.
• Lightweight & Layering-Friendly – Thinner fleece options provide warmth without bulk, making them perfect for layering under tight-fitting jackets.

When to Wear It as a Mid-Layer?

❄️ Ideal for higher-intensity winter training where you expect to sweat more.
❄️ Works best under an insulated or windproof outer layer like the WP Performance or the Mid-Season jackets for warmth and protection.
❄️ An excellent choice for fast-paced road cycling, where thermoregulation matters.

When to Wear It as a Top Layer?

• If conditions are mild (10°C to 15°C / 50°F to 59°F), the Primaloft Fleece Jersey can be worn alone, offering some insulation while maintaining breathability.
• Three convenient pockets at the back to store your essentials.
• If riding in dry but slightly chilly conditions, pair it with an Air Gilet to protect the chest.
• Perfect for tempo training rides, where you need warmth but don’t want to overheat.
• Winter Running, spring x-country skiing

Best Use: If you prioritize fast drying, moisture control, and lightweight performance, the Fleece Jersey is your best bet.

How to Choose Between These Two Mid-Layers

• For casual long rides & multi-day adventures? → Poly-Merino blend is best for its warmth and odor resistance.
• For high-intensity winter training? → Pure polyester/polyamide fleece keeps you drier and performs better in sweat-heavy rides.
• Looking for one versatile option? → A poly-merino fleece-lined jersey with a lightweight windproof vest like the Air Gilet gives you the best of both worlds.
See how they stack against each other, and pick the one that suits your riding style the best!

The Poly Merino Jersey is available in three colors: dark grey, blue, and burgundy, while the Fleece Jersey is available in shark grey.

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