Boltzmann's Constant Crewneck Sweatshirt S-5XL — Physics Formula Pullover (1.380649×10⁻ J/K)

A soft, mid-weight crewneck sweatshirt that carries a quiet, clever statement for anyone who loves physics. The clean black fabric puts the white embroidered text—"Boltzmann's Constant" and its numeric value—in clear focus, creating a low-key, academic vibe that reads like a nod between classmates in a lab or late-night study group. It feels like slipping into a familiar lecture hall: comfortable, slightly scholarly, and warm enough for chilly labs, campus walks, or coffee-run debates. The tubular knit and ribbed collar keep the shape through repeated wear, while double-needle stitching at stress points promises longevity. Subtle DTF neck labeling and optional embroidery placements let you personalize how this piece represents your curiosity.

Product features
- Medium-heavy 50/50 cotton-poly blend (8.0 oz/yd²) for warmth and durability
- Tubular knit (no side seams) with ribbed knit collar to retain shape
- Double-needle stitched seams and tear-away label for comfort and strength
- OEKO-TEX® certified dyes; ethically grown US cotton (Gildan 18000)

Care instructions
- Machine wash: cold (max 30C or 90F)
- Non-chlorine: bleach as needed
- Tumble dry: low heat
- Do not dryclean
- Do not iron