How can a fibre that warms us in winter keep us cool in summer?
It all started with a cool sheep
The merino sheep who grow our wool live in New Zealand’s wild and rugged Southern Alps. In the summer, when temperatures soar to 40°C (95°F), the merino could die from heat exhaustion without his thin, breathable fleece. In winter, he grows a thicker fleece to protect against temperatures as low as -15°C (-4°F).
By observing how the merino’s fleece works in nature, we’ve developed this fibre into a clothing system that’s cool in the heat and warm in the cold.
Unlike synthetics, merino is an active fibre that works to keep your body at its ideal temperature – whatever the weather.
Your body is always trying to maintain an even temperature. So when it’s hot or you’re working out, your body tries to keep you cool by sweating. As the sweat evaporates, it absorbs heat from your skin.
That’s fine when you’re naked, but most fabrics interfere with the evaporation of sweat. Cotton and synthetics trap sweat in the fabric and keep it close to your skin, leaving you feeling hot and damp.
But merino fibre and fabric is highly “breathable”, which means it’s great at managing sweat.
As you heat up, merino absorbs and releases moisture before it turns into sweat. So you stay cool and comfortable without overheating or feeling clammy and stinky.
• Your body tries to keep you cool by sweating. As the sweat evaporates, it absorbs heat from your skin.
• Cotton and synthetics interfere with this process by keeping sweat trapped in the fabric, next to your skin.
• Icebreaker merino absorbs and releases moisture vapour before it turns into sweat, leaving you feeling cool, dry and comfortable.