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Seamless Activewear

Seamless Innovation
in Activewear & Workwear

Experience second-skin comfort with Keen Sun International’s high-tech seamless garments — engineered for performance, style, and all-day wearability.

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About Keen Sun International

Seamless technology is the latest innovation in smart wear production. At Keen Sun International, we utilize advanced Italian knitting machines to craft garments that redefine comfort and functionality.

Our seamless wear eliminates labels, side seams, and elastic waistbands — reducing friction, pressure marks, and discomfort. Designed with super-elastic and functional yarns, our products offer a true second-skin feel.

We use premium materials including Merino wool, Microfiber, Lycra, Lurex, Cotton, and Viscose — engineered for moisture-wicking, warmth, UV protection, anti-flame properties, and long-lasting softness.

Factory View

Our Product Range

From seamless yoga wear to functional workwear, our collection combines cutting-edge technology with premium materials for unmatched comfort and performance.

Seamless Yoga Leggings

Seamless Yoga Leggings

Ultra-stretch microfiber blend with moisture-wicking and UV protection. Ideal for yoga, pilates, and daily wear.

  • • Seamless construction
  • • 4-way stretch
  • • Breathable & quick-dry
Women's Seamless Sports Bra

Women's Seamless Sports Bra

Lightweight support with soft-touch microfiber. No wires, no seams, no irritation — perfect for high-intensity workouts.

  • • High elasticity
  • • Anti-odor treatment
  • • Second-skin fit
Men's Seamless Trunks

Men's Seamless Trunks

Designed for all-day comfort. Seamless waistband and no-label design eliminate chafing and pressure.

  • • Microfiber + Lycra blend
  • • Moisture management
  • • Tagless & itch-free
Seamless Workout Set

Seamless Workout Set

Complete women’s set: sports bra and high-waisted leggings. Coordinated styles in multiple colors.

  • • Matching sets available
  • • UV protection
  • • Machine washable
Knitted Workwear Pants

Knitted Workwear Pants

2023 new style workwear with seamless waistband. Durable, stretchable, and designed for long shifts.

  • • Reinforced stitching
  • • Anti-static fabric
  • • Flame-resistant options
Seamless T-Shirt

Seamless T-Shirt (Men)

Minimalist design with no side seams. Ideal for layering or standalone wear in professional or casual settings.

  • • Cotton-viscose blend
  • • Wrinkle-resistant
  • • Soft inner lining
Women's Seamless Top

Women's Seamless Top

Elegant and functional. Perfect for office wear or casual outings. No visible lines under outer clothing.

  • • Breathable mesh panels
  • • Seamless neckline
  • • Available in 8 colors
Seamless Leggings for Men

Seamless Leggings (Men)

Functional base layer for work or sport. High thermal retention and moisture control.

  • • Thermal insulation
  • • Anti-bacterial finish
  • • Stretch recovery
Seamless Slack Suit

Seamless Slack Suit

Professional-grade seamless suit for industrial and technical environments. Flame-resistant and durable.

  • • FR-certified fabric
  • • Ergonomic fit
  • • Multi-pocket design
Seamless Underwear Set

Seamless Underwear Set

Complete unisex set: top and bottom. Ideal for sensitive skin and long-duration wear.

  • • Hypoallergenic
  • • No elastic irritation
  • • Pack of 3 or 5
Merino Wool Seamless Wear

Merino Wool Seamless Wear

Natural temperature regulation with ultra-soft Merino wool blend. Ideal for cold climates.

  • • Natural fiber blend
  • • Odor-resistant
  • • Biodegradable
Lurex-Enhanced Activewear

Lurex-Enhanced Activewear

Stylish metallic-thread designs for fashion-forward performance wear. Reflective for low-light visibility.

  • • Fashion + function
  • • Reflective detailing
  • • Stretch recovery

Why Choose Keen Sun?

High-Tech Italian Machines

We use state-of-the-art seamless knitting technology from Italy to ensure precision, durability, and comfort in every garment.

Premium Material Blends

From Merino wool to Lycra and Lurex, we select only the finest functional yarns for performance, softness, and longevity.

Second-Skin Comfort

No labels, no side seams, no elastic pressure. Our garments move with your body, offering unmatched comfort and freedom.

15+
Years in Industry
30+
Global Clients
500K+
Units Shipped
100%
Seamless Tech

Frequently Asked Questions

What is seamless clothing?

Seamless clothing is made using advanced circular knitting technology that creates garments in a single piece without side seams. This results in a smooth, comfortable fit with no chafing or irritation.

Are Keen Sun garments suitable for sensitive skin?

Yes. Our seamless construction eliminates friction points, and we use hypoallergenic, soft-touch materials like microfiber and Merino wool that are ideal for sensitive skin.

Do you offer custom designs or private labeling?

Yes, Keen Sun International supports OEM and ODM services. We can customize designs, colors, and branding for bulk orders.

What are the care instructions for seamless wear?

Machine wash cold with like colors. Do not bleach. Tumble dry low or hang dry. Avoid fabric softeners to preserve elasticity and moisture-wicking properties.

Can your workwear meet industrial safety standards?

Yes. We offer flame-resistant (FR), anti-static, and UV-protective workwear options that comply with international safety standards.

Get in Touch

Interested in our seamless activewear or workwear solutions? Reach out to our team for inquiries, samples, or custom orders.

Address:

Room 201, Unit 14, No.999 Shuiqing Road, Shanghai, China 201103

Phone:

+86 21 18516670372

Email:

[email protected]

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