Yes. The Radians ST21B-3POS is an ANSI/ISEA 107 Type R, Class 3 long-sleeve safety T-shirt built for hot-weather comfort. It's made from 100% polyester Birdseye mesh with Max-Dri™ moisture-wicking technology that pulls sweat away from the skin for breathability, and the long sleeves give full-length coverage from sun and abrasion while keeping the shirt cool. The black-bottom color blocking at the base and lower sleeves helps hide dirt and grime. It's a strong pick for road crews, utility, landscaping, and construction workers who need maximum visibility without overheating.

The Radians ST21B-3POS meets ANSI/ISEA 107, Type R, Class 3. Type R means it's designed for roadway and off-road workers exposed to traffic, and Class 3 is the highest visibility level in the standard — requiring the most background and reflective material for conspicuity, including coverage on the torso and sleeves. It uses 2" stretchable, heat-transfer reflective tape as one horizontal stripe on the torso plus a stripe on each sleeve.

Max-Dri™ is Radians' moisture-wicking mesh technology built into the ST21B. It draws perspiration away from the body so it can evaporate, keeping the wearer drier and cooler in hot conditions. Combined with the shirt's 100% polyester "arid" Birdseye mesh construction, it delivers high breathability without sacrificing durability, so the Class 3 shirt feels much lighter and cooler than a standard knit safety tee.

Yes. As an ANSI/ISEA 107 Type R, Class 3 garment, the Radians ST21B-3POS is intended for workers who need the highest level of high-visibility protection, including those exposed to roadway traffic and higher-speed or complex work environments. Class 3 provides more reflective and background material and full-body conspicuity (torso and sleeves) compared to Class 2, making it appropriate for road construction, flagging, utility, and emergency roadside work.

The Radians ST21B uses 2" stretchable, heat-transfer reflective tape that is bonded to the fabric rather than sewn on. Because there are no stitched seams around the tape, the shirt flexes and wears much more like a regular T-shirt — softer, more comfortable, and with fewer rub points — while still meeting ANSI/ISEA 107 Class 3 reflectivity. The tape is applied as one horizontal stripe on the torso and a stripe on each sleeve.

The Radians ST21B is available in sizes M, L, XL, 2XL, 3XL, 4XL, and 5XL. It comes in two high-visibility color options with black-bottom color blocking: Hi-Vis Orange/Black and Hi-Vis Green/Black (the "3POS" style is the Hi-Vis Orange version). All sizes carry the same ANSI/ISEA 107 Type R, Class 3 rating.

Yes. The Radians ST21B-3POS is available with custom logo imprinting from Industrial Safety Products, printed at the left chest pocket and/or back center. The front chest pocket has no reflective material specifically so it can carry a corporate imprint. Imprinting requires a minimum order of 12 garments, a set-up fee may apply, and the first customization order includes one free imprint color per location. Orders below the minimum ship as non-logo items.

The Radians ST21B has black color blocking at the base of the shirt and the bottom of the sleeves. The darker lower panel helps hide dirt, grease, and grime that typically show up on the bottom of a hi-vis shirt, keeping it looking cleaner longer, while the high-visibility orange or green upper body and the reflective stripes still deliver full ANSI/ISEA 107 Class 3 conspicuity.

The Radians ST21B-3POS is a long-sleeve version, so it adds full-arm coverage for sun and light abrasion protection while still meeting ANSI/ISEA 107 Type R, Class 3. Unlike basic knit safety shirts, it uses breathable Birdseye mesh with Max-Dri™ wicking to stay cool, heat-transfer (not sewn) reflective tape so it feels like a normal T-shirt, and black-bottom color blocking to hide grime. It's built for workers who want the highest visibility class plus long-sleeve comfort in demanding conditions.

The Radians ST21B is rated for a maximum of 25 wash cycles while maintaining its ANSI/ISEA 107 Class 3 performance. Its 100% polyester Birdseye mesh is designed for breathability without compromising durability, and the heat-transfer reflective tape is stretchable to move with the fabric and resist cracking during normal wear.

The Radians ST21B-3POS Type R Class 3 Long Sleeve Black Bottom T-Shirt is available from Industrial Safety Products (industrialsafetyproducts.com) with free shipping. It's an ANSI/ISEA 107 Type R, Class 3 hi-vis shirt offered in sizes M–5XL, in Hi-Vis Orange/Black or Hi-Vis Green/Black, with optional custom logo imprinting for orders of 12 or more.