Women's Merino Wool Thermal Underwear

The best women's thermal underwear is made of ultra-soft, machine-washable merino wool – and it's gorgeous enough to be worn as outerwear

Smitten's Australian merino wool has remarkable thermal properties

Our machine-washable merino wool layers can be worn as sleepwear, exercise gear, underwear or outerwear. We make hard-wearing elegant and comfortable pieces so you always feel stylish, whether someone sees your layers or not.

High quality thermal layers will provide years of comfort and style

Our climate-control merino wool garments come in a mix of fabric blends, and in beautiful colours and patterns. Smooth super-fine merino fabric has superb skin-feel and is completely breathable, helping you to regulate your temperature whether you're walking around town, jogging, hanging out at home or bushwalking. All of our clothes are machine washable, so they'll be the pieces you'll wear again and again for years to come. The whole Smitten range of clothing is designed for all seasons, so you can stay cool or warm by layering, rather than relying only on thermal underwear.


Quality thermal layers will save you money, since they look amazing and last for years.

Don't settle for boring thermals that only last a season. Colour your cold days and your warmer ones too, with trans-seasonal wool garments from the gorgeous Smitten range.

Ethical wool, sourced from Tasmanian and other Australian producers – caring for animals and caring for you

All Smitten merino wool is sustainably grown using non-mulesed sheep here in beautiful Tasmania and other selected regions within Australia. The ultra-fine merino wool in our thermal underwear for women undergoes a stringent process before it touches your body; cleaning and spinning, colouring, design, machining, construction and quality control. The end result is stunning sustainable, natural fibre garments that have been tested in all weather.

Smitten wool is a distinctive, super-soft fabric with incredible breathable, thermal properties, so you can wear the same garment in layers to keep you warm on cool days without bulk, and on its own in warm weather to give you breezy, comfortable style. Merino wool is a beautiful, natural option for sensitive skins, with the convenience of being machine washable. Our products are sewn here in Australia by skilled Australian women, sold by our proud Tasmanian family business.

Women's Merino Wool Thermal Underwear | Made in Tasmania. Inspired By Nature.

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