Choosing thermals can feel straightforward until you start comparing the fabrics. Cotton, wool, silk and cashmere all appear in thermal clothing, often alongside other fibres.

The best thermal fabric depends on where you’ll wear it, how much coverage you want and what feels comfortable against your skin. A layer for a cool office has a different job from one you’ll wear throughout a winter holiday.

Start with your routine, then look at the complete garment. Fabric composition, thickness, fit and the clothes worn over it all matter.

Compare the Garment, Not Just the Fibre Name

A product described as a cashmere thermal may contain cashmere blended with modal and elastane. A wool-and-cotton garment may have a cotton inner surface and a different blend on the outside.

Those details help explain how a garment is constructed and what will touch your skin.

Before choosing, check:

• Composition: Which fibres are included, and in what percentages?
• Construction: Is the fabric fine, ribbed, stretchy or double-faced?
• Coverage: Do you need a tank, long sleeves or a higher neckline?
• Layering: Will it fit comfortably beneath your usual clothes?
• Care: Can you follow the garment’s washing and drying instructions?

You can use The baseLINE thermal collection as a starting point, then compare the individual product descriptions.

Thermal Fabrics at a Glance

These are starting points for comparison. A fibre name alone doesn’t establish how warm a particular garment will be.

Cotton Thermals for Familiar Everyday Layering

If you already enjoy wearing cotton singlets and tops, a cotton layer may be a practical place to start.

Consider how much coverage you need. A tank adds a layer through the body without adding sleeves beneath a shirt or cardigan. For more coverage, compare long-sleeve options.

The TBL Cotton Tank Top with Guipure Lace in White is described as being made from 100% Egyptian Mako cotton. It’s one option to compare if you prefer a cotton tank.

Browse the cotton thermals collection, checking each garment’s composition rather than assuming every cotton-labelled style is identical.

Wool Thermals: Look Closely at the Blend

When comparing wool thermals, read beyond the product name.

Wool may be blended with silk, acrylic, polyamide or other fibres. The proportion of each fibre and the fabric’s construction affect the finished garment, so two wool-labelled tops can feel quite different.

If you’re unsure about wool against your skin, try the specific garment where possible. You may prefer one texture or construction over another.

A Cotton Inner Surface Is Another Option

The Wool & Cotton Doubleface Long Sleeve Top in Ivory has different compositions on its two surfaces:

• Inner: 100% cotton.
• Outer: 64% acrylic, 30% wool and 6% polyamide.

This makes it useful to compare if you want cotton against your skin while exploring a garment with wool in its outer construction.

It also shows why checking the full label matters. The product name doesn’t list every fibre used.

Silk Thermals: Distinguish Silk From Silk Blends

When shopping for silk thermals, check whether you’re looking at pure silk or a blend.

The Wool & Silk Long Sleeve Top in Ivory, for example, contains 85% wool and 15% silk. It has a ribbed finish and a scoop neckline.

That is a wool-rich garment containing silk, rather than a pure-silk layer. Compare it on that basis when deciding what suits your wardrobe.

Within the silk thermals collection, use the individual product information to check composition, coverage and care requirements.

Cashmere Thermals: Check the Percentage

Cashmere may be part of a blend rather than the main fibre in a thermal.

The TBL Modal Cashmere Long Sleeve Top in Ivory contains 85% modal, 9% cashmere and 6% elastane.

Its product description identifies it as a fine, lightweight layer and notes that it becomes more sheer as it stretches. That is worth considering if you want to wear it beneath clothing or need more coverage.

When browsing cashmere thermals, compare the full composition and fabric description. Don’t assume a cashmere blend will have the same thickness or feel as a pure-cashmere jumper.

Where Does Modal Fit In?

Modal is also relevant when comparing thermal blends. In the top above, it makes up most of the composition.

If you’re choosing between two garments, look at all their fibres and their construction. A small cashmere content doesn’t tell you everything about how the finished layer will feel or fit.

Choose for Your Climate and Routine

Think about the conditions you’ll actually spend time in.

For a cool office, you might want a layer that fits neatly beneath work clothes. For changeable weather, consider how easily you can add or remove your outer layers.

If you’re packing for a colder destination, check the expected conditions and the complete outfit you’ll wear. The thermal is one part of that outfit, alongside your mid-layer, outerwear and accessories.

For strenuous activity or demanding outdoor conditions, look for clothing specifically suited to that use. An everyday thermal’s fibre name is not evidence of technical performance.

Fit and Care Matter Too

Try your thermal beneath the clothes you intend to wear over it. Check for pulling at the shoulders, bunching at the waist and restricted movement through the arms.

Use the size guide for that garment. Stretch and coverage can vary between fabrics, and a fine fabric may become more transparent when stretched.

Follow the attached care label. Don’t assume that two garments can be washed together simply because both contain wool, cotton or silk.

Find the Layer That Suits Your Day

Choose your thermal by combining fabric preferences with the coverage, fit and care routine you need.

Cotton, wool-rich blends, wool and silk, and modal-cashmere blends offer different options to compare. Reading the complete composition helps you choose with a clearer understanding of the garment.

Explore The baseLINE thermal layers.

Frequently Asked Questions

1. What is the best thermal fabric for everyday wear?
   Start with what feels comfortable against your skin and fits beneath your usual clothing. Compare the garment’s composition, thickness and coverage alongside your daily conditions.
2. Are all wool thermals made from pure wool?
   No. Wool thermals may contain other fibres. Check the full composition, including separate inner and outer fabrics where listed.
3. Are silk thermals always 100% silk?
   No. Some contain silk blended with wool or other fibres. The featured Wool & Silk Long Sleeve Top contains 85% wool and 15% silk.
4. Does a cashmere thermal contain mostly cashmere?
   Not necessarily. Check the percentage on the product page or label. The featured TBL Modal Cashmere Long Sleeve Top contains 9% cashmere.
5. Can I judge warmth from the fibre name alone?
   No. Fabric weight, construction, coverage, fit, activity and the other layers you wear also affect the result.