Astrolabio Thermal Base Layer R18L 5KT T15H 2V: Technical Base Layer for Active Women
The Astrolabio R18L 5KT T15H 2V black thermal base layer is the technical base layer designed for women who practice high-intensity winter outdoor sports. The highly breathable synthetic fabric wicks sweat away from the skin, keeping it dry and preventing post-exertion cooling during skiing, running, trekking, and mountaineering.
Sweat-Wicking Technology: Always Dry Skin
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Highly breathable synthetic fabric: technical fibers that transport moisture from the skin to the outside through capillarity, reducing sweat accumulation by 70% compared to cotton
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Quick-drying: the fabric expels moisture 5 times faster than cotton, drying completely in 1-2 hours even during prolonged activity
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Active thermoregulation: maintains constant body temperature between -10°C and +15°C external, adapting to exertion intensity
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Anti-odor: antibacterial treatment that reduces the proliferation of odor-causing bacteria, allowing multiple uses between washes (2-3 sessions)
Ergonomic Second Skin Fit
The ergonomic close fit follows the curves of the female body without compressing, ensuring total freedom of movement. Flat seams eliminate chafing on shoulders, hips, and armpits even with a backpack or suspenders. The elastic crew neck does not constrict the neck during intense breathing. Extended length covers the lower back even in a bent position (skiing, trekking).
Who It's For
This base layer is perfect for sporty women who practice high-intensity winter outdoor activities. Ideal as a base layer for alpine skiing, cross-country skiing, snowboarding, winter running (below 10°C), mountain trekking, mountaineering, snowshoeing. Excellent for temperatures -10°C / +15°C as a first layer under fleece/softshell/jacket. Also suitable for winter cycling, autumn trail running, outdoor fitness.
Layering System for Maximum Performance
Layer 1 (base): this Astrolabio thermal base layer in contact with the skin to wick away sweat. Layer 2 (insulating): fleece or microfleece to retain body heat. Layer 3 (protection): waterproof-breathable jacket for protection from wind, snow, rain. Remove layer 2 if the temperature rises or intensity increases, but always keep the base layer for sweat wicking.
When NOT to Choose It
Avoid this base layer if you are looking for everyday casual comfort (the close-fitting technical fabric is not ideal for relaxation), if you practice low-intensity sports below 0°C (prefer warmer merino wool), or if you have very sensitive skin (some women find synthetics less comfortable than merino). Not suitable for temperatures above +20°C (risk of overheating).
Differences vs Competitors
Compared to Odlo Evolution Warm, the Astrolabio R18L offers 30% faster drying thanks to a lighter fabric. Against X-Bionic Energizer, it guarantees a less compressive fit (superior comfort for 4-6 hour sessions). Vs Icebreaker merino wool, it features more effective sweat wicking (+40%) but less odor control (merino is superior for multiple uses of 5-7 days).
Care and Durability
Washing: machine wash 30°C delicate cycle, neutral liquid detergent (no fabric softener which reduces breathability and damages the anti-odor treatment). Drying: lay flat or hang, no tumble drying which damages elastic fibers. No ironing. Estimated durability: 4-5 seasons (200-250 days of use) with proper care. The fabric retains 90% of its sweat-wicking properties even after 100 washes.
Technical Specifications
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Material: 100% highly breathable technical polyester
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Weight: 110 g (size M)
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Fit: Ergonomic close fit (second skin)
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Seams: Flat anti-chafing
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Crew neck: Elastic non-compressive
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Length: Extended lumbar cover
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Treatment: Antibacterial anti-odor
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Operating temperature: -10°C / +15°C (as a base layer)
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Seasonality: Autumn-Winter (October-April)
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Color: Black
Frequently Asked Questions
Can I use it as a single layer? Only if the temperature is mild (+10°C/+15°C) and the activity is very intense (fast running, competitive cross-country skiing). Otherwise, an insulating layer is needed over it.
How many times can I use it before washing? The anti-odor treatment allows 2-3 consecutive uses (6-9 total hours) before washing, unlike cotton which requires washing after each session.
Is synthetic or merino wool better? Synthetic wicks sweat faster (ideal for high intensity), merino controls odors better and is warmer at rest. For alpine skiing/intense running, prefer synthetic; for multi-day mountaineering, prefer merino.
