The Kathartik Kup

🧵 Fit Guide

Our shirts are designed with strength athletes in mind, which means they run slightly larger than standard sizing to allow for a more comfortable, performance-ready fit. To get the best results, we recommend choosing your size based on body weight rather than your usual shirt size.

Size Recommendations:
– 2X-Small: 139 lbs and below
– X-Small: 139–165 lbs
– Small: 165–183 lbs
– Medium: 183–205 lbs
– Large: 205–231 lbs

If you’re in between sizes and prefer a tighter fit, you can size down.

For a looser or more relaxed fit, go with the higher size in your range.

Still unsure? Select the size that matches your weight range—if it doesn’t fit, we’ll happily exchange it.

Meet the Kathartik Kup—our stainless steel shaker designed to keep your drinks tasting fresh and free from lingering odors or harmful chemicals. Say goodbye to the stale, funky odors that cling to plastic shakers. Our non-insulated, food-grade stainless steel design ensures that once you wash it with a little dish soap, yesterday’s protein shake doesn’t come back to haunt you.

What Makes the Kathartik Kup Special?

Easy to Clean & Odor-Free: Unlike plastic, stainless steel rinses clean every time—so no more lingering funk! A quick rinse with dish soap leaves it clean and fresh every time.

Lightweight & Easy to Carry: Less bulk, more freedom. Toss it in your bag without the extra weight of insulating layers.

Smart Material Choice: Stainless steel helps you avoid plastic exposure, including BPA and similar chemicals (BPS, BPF, BPAF, TMBPF)—all of which can pose hidden risks.

Durable & Eco-Friendly: Crafted to withstand everyday bumps and drops. Ditching single-use plastic bottles and repeatedly replacing smelly plastic shakers helps reduce waste.