Ramanujan’s Constant Sweatshirt S-5XL — e(π√163) Math Crewneck for Nerds & Students
This black crewneck sweatshirt celebrates mathematical wonder with a clean, bold print that references Ramanujan’s constant and its numerical expansion. Soft yet substantial, the sweatshirt drapes comfortably while the typography-centered design reads like a quiet inside joke for math lovers — the kind you wear to lectures, coffee shops, or late-night study sessions. The neutral black keeps the focus on the white print, making equations pop and inviting conversation from fellow enthusiasts. It feels cozy on chilly mornings and practical during long problem-solving sessions, blending everyday comfort with intellectual flair.
Product features
- Medium-heavy 50/50 cotton-poly blend (8.0 oz/yd²) for warmth and durability
- Tubular knit with no side seams for a smoother fit and less fabric waste
- Ribbed knit collar and double-needle stitching at seams for shape retention and longevity
- OEKO-TEX® certified dyes and ethically sourced US cotton; meets safety and compliance standards
Care instructions
- Machine wash: cold (max 30C or 90F)
- Non-chlorine: bleach as needed
- Tumble dry: low heat
- Do not dryclean
- Do not iron
Without side seams
Knit in one piece using tubular knit, it reduces fabric waste and makes the garment more attractive
Ribbed knit collar with seam
Ribbed knit makes the collar highly elastic and helps retain its shape
Embroidery
Embroidery decoration method available on either left chest, center chest, or large center chest, as well as right + left wrists
Age restrictions
For adults
Other compliance information
Meets the flammability, lead, cadmium, bisphenols and phthalates level requirements.
Country of origin
Made in Nicaragua
DTF inner neck labels
The inner neck labels and wrist prints are printed using the Direct-to-Film (DTF) print method, while the rest of the prints are done with the Direct-to-Garment (DTG) method.
Do not dryclean; Do not iron; Machine wash: cold (max 30C or 90F); Non-chlorine: bleach as needed; Tumble dry: low heat.
Accurate shipping options will be available in checkout after entering your full address.
Any goods purchased can only be returned in accordance with the Terms and Conditions and Returns Policy.
We want to make sure that you are satisfied with your order and we are committed to making things right in case of any issues. We will provide a solution in cases of any defects if you contact us within 30 days of receiving your order.
See terms and conditionsCharlotte Place Design is an ecommerce print-on-demand retail shop operating through a Printify Pop-Up Shop storefront. Order fulfillment is supported through Printify’s production and delivery infrastructure. Printify is one of the largest print-on-demand groups globally, providing services for, amongst others, Etsy customers. At present the urls charlotteplacedesign.com, charlotteplaceart.com, CPDesign.com all point to this site.
© 2025 Eco Essentials
Designs © 2026 Charlotte Place Design
and Christopher Fayers