★ Handmade in New Zealand
Brass Monkeys Merino
Thermal Base Layers
Thermal Base Layers
100% pure merino wool clothing for men and women. Lightweight warmth, natural odour resistance, and unbeatable softness — handmade in New Zealand.
★★★★★ 1,100+ Five-Star Reviews ✦ Trusted since 2014
★★★★★
Can't go through a Winter without these!
"What a beautiful product — warm, soft, extreme comfort."
— Verified Customer | Merino Long Sleeve
Merino Long Sleeve
Merino Men's Long Johns
Merino Men's Singlet
Merino Long Sleeve
Merino Men's Boxers
Merino Short Sleeve V Neck
Merino Short Sleeve
Merino Long Johns / Leggings
Merino Neck Warmer
Merino Skull Cap Beanie
Merino Beanie with Dual-Layer
Merino Long Johns
Merino Balaclava
Merino Turtleneck Skivvy
Merino Turtleneck Skivvy
Strong Wool Beanie
Merino Long Sleeve - Flame Resistant
Merino Neck Warmer - Flame Resistant
Strong Wool Pullover
Long Merino Beanie - Flame Resistant
Merino Long Johns - Flame Resistant
Merino Skull Cap Beanie - Flame Resistant
Merino Short Sleeve - Flame Resistant
Merino Balaclava - Flame Resistant
Why Brass Monkeys Merino?
Not all thermals are created equal. Here's what makes 100% pure NZ merino wool the smart choice.
Lightweight Warmth
Merino traps body heat without the bulk. Thinner than synthetics but warmer — sits comfortably under work clothes or gear.
Anti-Odour Protection
Naturally anti-bacterial. Wear them for days without washing — merino resists odour like no synthetic fabric can.
Moisture Wicking
Absorbs up to 30% of its weight in moisture and still feels dry. Perfect for hiking, skiing, or working outdoors.
Premium Softness
Fine merino wool feels like silk against your skin. No itch, no irritation — just pure comfort all day.
Made in New Zealand
Every garment is handmade right here in New Zealand. Supporting Kiwi makers and local manufacturing.
Eco-Friendly
100% natural, renewable, and biodegradable. No plastic, no microfibre pollution — truly sustainable.
About Brass Monkeys Merino
Brass Monkeys is Smart Merino's premium range of 100% pure merino wool thermal base layers, handmade in New Zealand. Every garment is crafted from premium merino wool and handmade in New Zealand — delivering the perfect balance of warmth, softness, and breathability.
Why Choose Merino Over Synthetics?
Unlike polyester or nylon thermals, merino wool is naturally temperature-regulating, anti-bacterial, and moisture-wicking. It keeps you warm when it's cold and cool when it's warm. Merino is naturally odour-resistant, meaning you can wear it multiple days without washing — perfect for travel, multi-day hikes, or simply getting more wear between washes.
Perfect For Every Activity
Whether you're hiking, skiing, working outdoors in the cold, or just commuting on a frosty morning, Brass Monkeys merino base layers are your ideal first layer. The slim fit design sits comfortably under any clothing without adding bulk.
Our Multibuy Promise
Save on selected products when you buy more. Buy 3 and save 10%, or buy 5+ and save 15%. Discounts are applied automatically at checkout.
Ready to Feel the Merino Difference?
Free shipping on NZ & AU orders over $100 · 30-day returns · Multibuy savings on selected products