The Sport-Tek ST350 is the shirt you order when you need to outfit 300 people for a charity 5K, a school spirit event, or a summer sports league — and you need every single one to hold up through sweat, sun, and a hundred wash cycles without the colors going muddy. At 3.8 oz of 100% polyester interlock, it’s built purely for performance: moisture wicks fast, sweat evaporates faster, and the roomy athletic cut gives a full range of motion without clinging. The real differentiator is PosiCharge® technology, which locks dye to the fabric at a molecular level so black stays black, neon stays neon, and your screen-printed logo doesn’t end up ghosted by dye migration after the first wash. It’s not trying to be a lifestyle shirt — it’s trying to be the most functional, most affordable athletic tee you can put your logo on. And it wins.
Sport-Tek ST350 PosiCharge Competitor Frequently Asked Questions
What is PosiCharge® technology and why does it matter?
Product
PosiCharge® locks dye into the fabric at a molecular level during manufacturing. Standard polyester is notorious for dye migration — dark shirt dye bleeding into a lighter custom logo — and for fading in the sun. PosiCharge eliminates both problems, keeping colors vibrant and custom prints crisp wash after wash.
Is the ST350 good for sports teams and bulk athletic orders?
Product
It’s purpose-built for exactly that. The roomy athletic fit accommodates a wide range of body types, the moisture-wicking interlock fabric performs during real physical activity, and the wholesale price point makes outfitting entire leagues, schools, or corporate teams completely practical. Safari Sun has no order minimums, and volume pricing drops significantly at 12, 24, 48, and beyond.
What custom decoration options are available for the ST350?
Decoration
Screen printing, heat transfers, and DTF (Direct to Film) all perform well on the ST350’s smooth interlock face. Because it’s 100% polyester, low-bleed inks are required to prevent dye migration into lighter-colored prints. Sublimation is technically possible but requires testing — contact our team if full-color sublimation is your goal.
Can I order the ST350 in bulk for an event or sports league?
Bulk Orders
Yes — and it’s one of the best blanks in the industry for exactly that use case. No minimums, tiered pricing that rewards volume, and a shirt that holds up through the entire season. Upload your logo at safarisun.com or contact our team for a quote on large group orders.
Best custom shirt makers for bulk orders — what should I look for?
Custom Shirts
For bulk athletic orders, the right blank and the right decorator matter equally. The ST350 handles volume beautifully — PosiCharge keeps colors consistent across large runs. Pair that with an in-house decorator who uses proper low-bleed inks on polyester and provides a proof before production, and every shirt in the box looks the same as the first.
How long does production and shipping take?
Turnaround
Production is business days or less from proof approval. Shipping is flat-rate $12.98, free on orders over $99. Rush orders are available upon request — contact us as early as possible and we’ll work around your deadline.
