Seobean Thermal Long Johns — 92% Viscose / 8% Spandex, Button Fly, 5 Colors

These thermal long johns from Seobean are designed for men who prioritize softness and comfort in their winter layers. The 92% Viscose fabric delivers a smooth, silky feel against the skin that's noticeably softer than cotton or synthetic thermal blends, while the 8% Spandex provides just enough stretch to keep the fit snug and secure without restricting movement.

What Is Viscose?

Viscose is a semi-synthetic fiber derived from natural wood pulp, prized for its soft, silk-like texture and excellent draping quality. In thermal underwear, it offers a level of comfort that feels noticeably different from standard cotton or polyester base layers — smooth against the skin, gentle on sensitive areas, and breathable enough for all-day wear.

Button Fly Design

A practical button fly adds everyday convenience, making these long johns much easier to wear during bathroom breaks throughout the day — no need to fully undress or deal with a complicated waistband. It's a small design detail that makes a big difference in daily usability.

Five Colors to Choose From

Available in Gray, Darkcyan, Camel, Beige, and Red — five versatile shades that work equally well as a base layer under jeans or as standalone loungewear at home. Available in sizes M through XXL, with a full size chart based on waist, weight, and height.