Discreet Cooling
A discreet cooling system designed for sauna, recovery, travel, and heat exposure.
Designed to work with the underwear you already own
Figure 01 — The System
— Context
Sauna is simple by design. But improvised cooling rarely is. Towels shift. Rectangular ice packs are the wrong shape. Cooling underwear turns a quiet moment into a production.
Tilly is a purpose-built cooling layer, designed to feel natural, discreet, and easy to use.
Designed to work with the underwear you already own.
— The System
A contoured cooling pack. A washable sleeve. A system designed for sauna, recovery, travel, and heat. Developed through repeated sauna and material testing.
01 — The Pack
Designed for natural placement during sauna and heat exposure. A tapered profile that sits where rectangular packs never could, in instant and reusable formats.
02 — The Sleeve
The sleeve is designed to help keep the pack comfortably in place during seated use and movement, and to soften the cold against the skin. Cleaned like any other garment.
03 — In Use
Designed to sit discreetly inside your existing underwear. A small routine that disappears into the larger one.
— Material Notes
The pack rests inside a washable cotton sleeve, so cold reaches the skin gradually rather than abruptly. The reusable pack flexes; the instant pack lays flat. Both share the same silhouette — refined through prototype testing and material iteration.
— Method
Refined through prototype testing and material iteration. Final cooling duration will be confirmed during validation.
Instant packs activate immediately. Reusable packs chill before use.
The washable sleeve softens the cold and helps keep the pack securely in place.
Designed to sit discreetly inside your existing underwear.
Swap packs as needed. Wash the sleeve between sessions.
— Proposed Launch Kit
Final kit contents confirmed after prototype validation.
Pre-order Now— Prototype Notes
Plain observations from product development, in lieu of testimonials we haven't earned yet.
Standard rectangular packs were too wide for natural placement.
ShapeA washable sleeve improved comfort and temperature control.
MaterialThe custom taper became the core design requirement.
Form— Pre-order
Pre-orders now open for the initial Tilly release. Limited first production run.
Pre-orders secure first access to the initial production run. Final shipping timing will be confirmed before fulfillment.
We'll share prototype updates, launch timing, and first production details by email.
— FAQ