An original Potassium (K) Atomic Number 19 Periodic Table of Elements Design. Potassium Element Design Perfect for enthusiasts, educators, and students in science, chemistry, physics, biology, science, teaching, education, STEM, and nerdy stuff! Crafted from a unique 40 singles tri-blend fabric, offering a lightweight, ultra-soft feel Classic crew neck design with side-seam construction ensures both comfort and a flattering silhouette Lighter colors are semi-sheer