Yes, wool in summer. The Summer Wool Collection is made in the USA from ultralight 100 gsm Nuyarn® merino wool, the lightest and most breathable wool fabric on the market. With UPF 40 sun protection, ultra-fast dry times, and natural odor resistance, these pieces outperform synthetics on the hottest days of the year. Whether you're riding gravel at high noon, hiking an exposed ridgeline, or spending a long afternoon on the water, Summer Wool keeps you cool, dry, and protected.

This is merino wool, reimagined for summer adventure.

At just 100 grams per square meter, Summer Wool is the lightest fabric Pinebury makes. For comparison, our Every-Season fabric is 145 gsm and our Winter Wool fleece is 220 gsm. That featherweight construction gives Summer Wool a barely-there feel and exceptional airflow, so heat and moisture escape instead of building up against your skin.

Despite its weight, Summer Wool is remarkably durable. Nuyarn® construction makes ultralight merino strong enough for daily wear, long tours, and repeat washing, without the fragility of traditional lightweight wool. It also works as a base layer when temperatures drop, which means these pieces earn a place in your rotation well beyond August.

At the heart of every Summer Wool piece is Nuyarn®, a patented spinning technology that transforms merino wool into a stronger, loftier, and more responsive fabric. Instead of twisting fibers tightly, Nuyarn drafts merino around a performance filament core. The result is a fabric that is lighter, stronger, and dries up to five times faster than conventional wool.

That construction is what makes a 100 gsm wool fabric possible. You get all the natural benefits of merino, including odor resistance, moisture management, and thermoregulation, in a fabric light enough and tough enough for the most demanding summer conditions.

It sounds counterintuitive, but merino wool is one of the best fabrics you can wear in the heat. Merino fibers actively move moisture away from your skin and release it into the air, cooling you as you sweat. Synthetics trap odor and cling when wet. Cotton soaks through and stays soaked. Ultralight merino stays comfortable, fresh, and dry through long, hot days outside.

• Naturally cooling: Merino regulates body temperature and wicks sweat before it saturates the fabric.
• UPF 40 sun protection: Built-in defense against UV exposure on long days in direct sun.
• Odor-resistant: Wear it for days between washes. Merino naturally resists odor buildup, even in the heat.
• Ultra-fast drying: Nuyarn® merino dries up to five times faster than conventional wool. Rinse it at camp and it's dry by morning.
• Soft and non-itchy: Fine merino fibers feel smooth against bare skin, with no chafe on long efforts.

Maine summers demand a lot from a shirt. Humid climbs inland, exposed miles on the coast, black fly season in the woods, and afternoons that swing from hot sun to cool fog. The Summer Wool Collection was designed and tested in exactly those conditions.

Whether you're riding the gravel roads of southern Maine, hiking the open ledges of Acadia, or paddling the lakes up north, Summer Wool delivers sun protection, breathability, and comfort without compromise.

Like all Pinebury garments, the Summer Wool Collection is proudly made in the USA, from fabric to final stitch. We work with trusted partners who share our values of craftsmanship, sustainability, and quality, and every piece is sewn in small batches by skilled makers who take pride in their work.

By keeping production close to home, we minimize waste, ensure fair labor, and maintain the highest standards of consistency. It's better for people, better for the planet, and better for your gear.

Summer Wool was built to perform on the bike, on the trail, on the water, and everywhere in between.

• Summer Wool Sun Hoodie: Full-coverage sun protection with UPF 40, a lightweight hood, and a longer rear hem for on-bike coverage. The one layer for gravel rides, fishing, paddling, and long exposed days.
• Summer Wool Short Sleeve Cycling Jersey: The lightest, most breathable jersey we've ever made. Ultralight merino with powernet-reinforced rear pockets to carry your ride essentials without sag.
• Summer Wool Tees: Available with or without a chest pocket. A slim athletic fit that works on the bike, on the trail, and around town, and doubles as a base layer in cooler temps.

Each piece features unisex sizing, subtle Pinebury details, and timeless styling that looks as good at the coffee stop as it performs on the ride.

Sustainable by Nature

Merino wool is a renewable, biodegradable fiber that leaves a lighter footprint than synthetic alternatives. Nuyarn® spinning uses 30 percent fewer raw materials and less energy than conventional methods, and the durability it adds means your gear lasts longer and stays out of the landfill.

Every decision we make, from fiber sourcing to packaging, reflects our commitment to sustainability and responsible manufacturing. Summer Wool is not just built for summer. It's built for the long haul.

Tested in the Maine Outdoors

Every Pinebury product is tested where we live and ride, across Maine's rugged coastline, forest roads, and mountain trails. The Summer Wool Collection was born from those conditions: century rides in July humidity, exposed hikes above treeline, and long days on the water under full sun.

We don't just design clothing for the outdoors. We live it, every day.

Is merino wool too hot for summer?
No. Ultralight merino wool is one of the coolest fabrics you can wear in hot weather. At 100 gsm, Summer Wool is lighter than most cotton t-shirts, and merino's natural moisture-wicking actively cools you as you sweat. Riders have worn Summer Wool through desert conditions on multi-week bikepacking routes without overheating.

What does 100 gsm mean?
GSM stands for grams per square meter, a standard measure of fabric weight. Merino fabrics typically range from 100 gsm (ultralight) to 240 gsm (heavy). At 100 gsm, Summer Wool sits at the lightest end of the spectrum, which is why it feels like wearing almost nothing at all.

Does Summer Wool provide sun protection?
Yes. Summer Wool is rated UPF 40, blocking the majority of UV rays. That makes it a smart choice for long rides, open-water days, and exposed trails where you'd otherwise be reapplying sunscreen.

How does merino compare to synthetic fabrics in the heat?
Merino wicks moisture, resists odor naturally, and stays comfortable when damp. Synthetics tend to trap odor after a single wear and can feel clammy once saturated. With Nuyarn® construction, Summer Wool also dries up to five times faster than conventional wool, closing the gap on the one traditional advantage synthetics held.

How do I care for Summer Wool?
Machine wash cold on gentle with mild detergent and lay flat to dry. Because merino resists odor, you can wear Summer Wool multiple times between washes, which saves water and extends the life of the garment.

What is the fit and sizing?
Summer Wool uses unisex sizing with a slimmer athletic fit. If you're between sizes or prefer a looser fit, we recommend sizing up. See the size chart on each product page for measurements.

Shop the full Summer Wool Collection and experience the difference that ultralight Nuyarn® merino wool makes. Crafted in the USA. Designed for hot-weather performance. Proven in Maine.