Two layers, two functions
Nullhaven's field prototype combines a fine insect mesh with a conductive, silver-coated shielding weave in its inner sleeping envelope. The mesh is intended to serve as a mosquito barrier when the envelope is zipped closed. The conductive textile is characterized for radio-frequency attenuation. These are separate material functions brought together in one shelter.
A separate ripstop outer shell faces the weather. The product description also lists mesh windows and top-and-side venting; airflow, heat, and humidity still depend on how the canopy is set up and on surrounding conditions.
Read attenuation as a prototype measurement
Nullhaven currently publishes prototype-level figures for selected cellular, Wi-Fi, Bluetooth, and GPS/GNSS bands. A decibel value describes attenuation under a defined measurement context; it is not a universal percentage and does not cover every device, orientation, opening, or radio environment.
The direct measurement report and final production results remain to be confirmed. These figures are not evidence of disease prevention, treatment, improved health, or medical safety. Nullhaven does not make those claims.
Closure and site conditions matter
The mesh barrier depends on closing the sleeping envelope as intended. A zipped canopy is not the same as an open shelter, and no enclosed setup can promise zero heat, humidity, or carbon-dioxide buildup. Choose a suitable sleeping site, keep ventilation in mind, and follow the product's setup guidance as it is finalized.
This article summarizes the current prototype description and published limitations. Materials, measurements, and final production specifications may change as they are verified.