Let’s be real — winter layering can feel like a chore. Bulky. Bunchy. Too warm inside, not warm enough outside. But what if your base layer felt like a second skin — soft, breathable, and naturally insulating? That’s where silk thermal underwear comes in. If you haven’t tried it yet, you’re in for a treat. Especially if you're looking for thermals for women that strike the perfect balance between comfort and performance.

At The Foundation, our thermal base layers are made for the woman who loves comfort, elegance, and functionality — whether she’s strolling through Melbourne CBD or planning an outdoor adventure on Aussie hiking trails.

Why Silk? The Unsung Hero of Winter Layers

We often think of wool blend fibres or synthetic fibres when prepping for colder days. But silk? It’s the underdog. Lightweight, naturally insulating, temperature regulating and ultra-soft, silk thermals are a game-changer for your winter wardrobe.

Unlike merino wool or heavy long johns, silk is a natural fibre that delivers incredible warmth without bulk. It’s also sustainably harvested, making it a renewable resource that supports eco-conscious choices — right in line with The Foundation’s curated values.

Benefits of Silk Thermal Underwear

• Lightweight yet warm: Ideal for layering under jeans, dresses, or office-ready outfits.
• Breathable and moisture-wicking: No more sweaty thermals. Silk excels in moisture absorption, whether indoors or during outdoor activities.
• Gentle on sensitive skin: Hypoallergenic and itch-free, it’s perfect for sensitive skin.
• Body temperature regulation: Keeps you cosy without overheating.
• Odour prevention: Natural silk fibres resist odour build-up.

How It Feels: Like a Second Skin

Imagine sliding into something so soft, you forget it’s even there. That’s the magic of silk. It moves with you, hugs your shape without clinging, and feels like a whisper on your skin.

Whether it’s a thermal top or thermal pants like our TBL Modal Cashmere Legging Black, these aren’t average thermal clothing — they’re wearable indulgence.

Why It’s Perfect for Women

When it comes to women's thermal underwear, fit and feel matter. The Foundation’s silk thermals are tailored for real women — flattering cuts, soft crew neck and scoop neck options, and no-bulk seams.

• Wool & Silk Long Sleeve Top Black — elegant and perfect for layering.
• Wool & Silk Long Sleeve Top Ivory — an everyday layering hero.
• Viscose / Modal Legging Black — slim, stretchable, and comfy.

Layering Tips: From Sleep to Street

• Sleepwear upgrade: Pair a thermal long sleeve top with matching leggings for dreamy nights.
• Everyday layering: Wear a thermal vest under your blouse or jumper.
• Outdoor essentials: Ideal beneath coats for brisk commutes or weekend 4WD and Touring adventures.

Shop the Silk Thermals Collection

Ready to upgrade your innerwear & underwear drawer? Browse our Silk Thermals Collection — comfort, performance, and elegance all in one.

You’ll find beautiful silk and silk blend tops with full thermal layering ability — all made from natural fibres. Bonus: FREE delivery Australia-wide on orders over $150 and access to subscriber only perks to reward you for subscribing to The Foundation.

Conclusion

Silk thermal underwear is a winter essential that blends comfort, warmth, and elegance. It beats bulky wool layers and enhances your outdoor adventure gear rotation.

From ski slopes to cheering for Australian Rules — your first layer matters. Make it silk.

→ Shop Silk Thermals Now

FAQs

1. Is silk thermal underwear really warm enough for winter?
   Yes, it naturally traps heat while staying breathable — ideal for layering.
2. Can I wear silk thermals every day?
   Absolutely. They’re perfect for travel + leisure, daily errands or relaxing at home.
3. Do silk thermals shrink in the wash?
   Follow care instructions — cold hand wash or gentle machine cycle recommended.
4. Are silk thermals good for sensitive skin?
   Yes — they’re hypoallergenic, breathable, and great for irritated skin.
5. What sizes do The Foundation’s silk thermals come in?
   XS to XL. Use our size guide or ask in-store for fit advice.