Men's Seaweed Sleeveless T-Shirt - Anthracite

A sleeveless performance tee cut in our signature SeaCell™ blend — 210gsm jersey, naturally breathable, naturally soothing against skin. Designed for movement, layering, and the kind of summer days where polyester becomes a problem. 68% TENCEL™ Lyocell, 29% SeaCell™, 3% Elastane — zero polyester, zero compromise.

Why You'll Love It

✔ 210gsm SeaCell™ jersey — technical-weight, breathable, soft against skin ✔ 68% TENCEL™ Lyocell — wood-pulp cellulose, smooth as silk, breathable as cotton ✔ 29% SeaCell™ — patented seaweed-infused lyocell, embeds natural antioxidants directly into the fiber ✔ 3% elastane — minimum stretch for recovery and shape retention ✔ Sleeveless cut — maximum airflow, full range of motion through the shoulder ✔ Naturally moisture-wicking — pulls sweat off skin as vapor before it becomes wet ✔ Naturally resists bacterial growth and odor — seaweed minerals stay active wash after wash ✔ Skin-soothing — antioxidants and minerals from seaweed stay in contact with skin every wear ✔ Chlorine-free finish — plastic-free, machine-wash-friendly ✔ 100% organic cotton labels — every component clean ✔ OEKO-TEX® STANDARD 100 certified — tested against 1,000+ harmful substances ✔ Radically reduced microplastic shedding — 97% cellulose-based fiber vs. 100% plastic in polyester activewear

Composition

Fabric: 68% TENCEL™ Lyocell / 29% SeaCell™ / 3% Elastane (210gsm) Labels: 100% organic cotton

Fit

True to size. The 210gsm jersey skims the body — close enough to layer under a jacket, loose enough to move freely through training. Sleeveless cut sits clean at the shoulder, no bulk under the arm. Designed for low- to high-impact movement, hot yoga, running, training, layering, or daily summer wear. If you are between sizes, stay true for a relaxed athletic cut or size down for a fitted silhouette.

The ZUBEK Difference

SeaCell™ is what happens when seaweed meets cellulose science. The fiber is spun from wood pulp (TENCEL™) and infused with seaweed extract during production — locking minerals, antioxidants, and trace elements directly into the fiber structure. Those compounds remain in contact with your skin every time you wear the fabric, every time you sweat into it, every wash cycle.

Polyester does the opposite. It traps heat against your body, holds moisture, breeds bacteria, and sheds microplastics into your skin every time you move. Performance polyester is finished with PFAS-based water repellents that absorb through warm, open pores. SeaCell™ is what activewear should have been the whole time — a fabric that performs because of what it is, not because of what's been added to it.

Care

Machine wash cold (30°C), inside out, on gentle cycle. Lay flat to dry — never tumble dry. Do not bleach. Skip fabric softener — it coats fibers and reduces breathability. Iron on low only if needed. Store folded, away from direct sunlight. SeaCell™ is naturally odor-resistant — wash less, wear more. See full care guide.

Origin

Made in Poland. Fabric sourced in Europe. Cut and sewn in Poland by hands we know, in a workshop we've visited.

OEKO-TEX® STANDARD 100 certified — every component independently tested against 1,000+ harmful substances and verified below scientifically established thresholds. No PFAS, no PFC, no quick-dry chemistry, no stain repellents.

Part of the SeaCell™ Activewear collection.