Thermal Base Layer Set
- In stock, ready to ship
- Free Express Shipping over $150 AUD
- Delivered within 1-4 business days
- Easy return, purchase with confidence
Performance Cold Weather Thermal Base Layer Set
Designed for all-day comfort and performance, this ultra-soft base layer set is crafted from a premium blend of 46% Modal, 46% superfine Merino wool, and 8% Lycra. Lightweight, breathable, and flexible, it works equally well as thermal underwear, loungewear, or sleepwear.
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All-in-One Versatility – Wear it as sleepwear, loungewear, or a performance-ready base layer.
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Premium Fabric Blend – 46% Modal, 46% superfine Merino wool, 8% Lycra for softness and stretch.
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Next-to-Skin Comfort – Smooth, itch-free, and breathable with no bulk.
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Performance Benefits – Moisture-wicking, odor-resistant, and temperature-regulating for active or casual wear.
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Flexible Fit – Designed to move with you—perfect for running, hiking, training, or everyday comfort.
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Winter Essential – Ideal for layering under outerwear or wearing solo indoors.
From outdoor adventures to cozy nights in, this Merino blend set delivers the perfect balance of comfort, style, and performance.
Jason is 180 cm tall and weighs 98 kg. He wears size XXL for a relaxed, comfortable fit Alex is 177 cm tall and weights 81 kg.He wears size L for a perfect fit.
- Ultrafine merino — 16.5–18.5µm fibres, soft on skin with no itch
- Temperature regulating — warm in the cold, cool in the heat
- Breathable & moisture-wicking — comfortable through any activity
- Naturally odour-resistant — wear longer between washes
- Easy care — machine washable, no ironing needed
- Responsibly made — 100% Australian wool, OEKO-TEX® Standard 100 & RWS certified
Lightweight, all-season comfort for everyday wear, travel and the outdoors.
Domestic (Australia & NZ): Free Express Shipping on orders over $150 AUD; standard rates apply for orders under $150 (calculated at checkout). Delivered within 1–4 business days.
International: Express shipping via Australia Post or DHL Express, estimated 5–14 business days depending on location. Customs duties & taxes are the recipient's responsibility.
Processing & tracking: Orders are dispatched within 1 business day; you'll receive a tracking number by email once shipped. We use eco-friendly packaging wherever possible.
Please double-check your shipping address at checkout — we're unable to change it after dispatch. Questions? info@masonwilliammerino.com.au or 03 6288 7615.
28-day change-of-mind returns (42 days for international orders). Items must be unworn, unwashed, in original condition with all tags and packaging, and not final sale or clearance. Proof of purchase required.
Your options: a refund to your original payment method (Afterpay refunds are processed less a 6% fee), an exchange, or a store credit valid for 24 months.
Exchanges: one free exchange per order — we cover the replacement shipping. Extra exchanges are AUD $15 (AU & NZ) or AUD $60 (international). Change-of-mind return postage is at your own cost.
Faulty or incorrect items: email your order number and photos of the fault and we'll fix it as soon as possible.
Not eligible: final sale / clearance items, underwear & intimate apparel (hygiene), and gift cards.
Returns are inspected and processed within 14 business days. Questions? info@masonwilliammerino.com.au or 03 6288 7615.
