Custom Merino Wool & Performance Base Layer Manufacturer

As a specialist base layer manufacturer, we create technical Merino wool base layers and moisture wicking shirts designed for all-season performance. Partner with us for your private label thermal apparel.

The Foundation of Your Layering System

Performance-Ready Fabrics

Moisture Management

Our base layers excel at wicking moisture vapor away from the skin, keeping you dry and comfortable during intense activity.

Versatile for Gym & Lifestyle

Intelligent Thermal Regulation

We specialize in Merino wool thermals that naturally adapt, providing warmth in the cold and breathability when you heat up.

Natural Odor Resistance

Natural Odor Resistance

Leveraging the natural antimicrobial properties of Merino wool to create base layers that can be worn for multiple days without odor.

Chafe-Free Comfort

Chafe-Free Comfort

Engineered with a next-to-skin fit and flatlock seams to function as a comfortable, irritation-free foundation.

In-Depth Customization: Create Your Perfect Custom Base Layer

Your brand is unique, and your products should be too. Explore the possibilities below.

Fabric & Materials

Select from our extensive library of premium performance fabrics, or work with us to develop a custom material.
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Fit & Construction

Define the core structure of your sports garment, from the silhouette and fit to the seams and construction techniques.
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Features & Functionality

Incorporate functional elements that add value and meet your customers’ specific needs.
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Color & Finishing

Choose from a limitless color palette with Pantone® matching, and explore various finishes and treatments.
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Branding & Logos

Apply your brand identity with a range of high-quality techniques for a professional finish.
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Start Your Custom Base Layers in 4 Simple Steps

Our streamlined process makes bringing your custom activewear line to life straightforward and efficient.
Inquiry & Consultation

Inquiry & Consultation

Design & Sampling

Design & Sampling

Bulk Production & QC

Bulk Production & QC

Shipping & Delivery

Shipping & Delivery

From Fabric to Final Sportwear Garment

We combine meticulous planning with advanced technology and strict quality control at every stage of production.

Your Premier Merino Wool Base Layer & Moisture Wicking Shirt Manufacturer

As a leading base layer manufacturer, Sansansun specializes in creating technical first layers for outdoor and athletic brands. Our core expertise is in producing premium Merino wool base layers, including merino wool thermals and merino wool long underwear. We also excel at engineering high-performance synthetic apparel, making us a top choice for brands seeking a moisture wicking shirt manufacturer.

We provide a complete partnership for your technical apparel needs. Our services include creating fully custom compression shirts and base layers for your private label line, as well as providing wholesale thermal underwear solutions. As a trusted wool base layer supplier, we are committed to sourcing the finest materials (including mulesing-free Merino) and delivering technically superior garments.
Your Premier Custom & Wholesale Yoga Pants Manufacturer

Your Advantage in the Conscious Activewear Market

Flexible MOQ & Sourcing

Flexible MOQ & Sourcing

From 30-piece wholesale orders for market testing to fully custom production runs, our flexible MOQ policy is designed to support your brand's growth.

Scale & Factory-Direct Pricing

Scale & Factory-Direct Pricing

Leverage our 600,000+ piece monthly capacity. Our scale and factory-direct model ensure you receive competitive pricing, maximizing your profit margins.

One-Stop Solution

One-Stop Solution

Go beyond manufacturing. Our solution includes precision strategic consulting and access to 800+ new annual styles for a faster, smarter launch.

Quality Guarantee

Quality Guarantee

Your products are backed by our rigorous multi-stage QC process, from incoming fabric inspection to a 100% final garment check.

Ready to Launch Your Next Best-Selling Collection?

Work with a partner who brings design, speed, and reliability together. We’ve helped 200+ growing brands launch faster, scale smarter, and win in their markets. You could be next.