ULTRA Liberty Belt, a belt with a large Ultra disk

It's seven in the evening and you're finally getting up from the desk you've sat at for most of the day. Before you sink into the sofa, you fasten a wide belt round your waist and slide the disk to the small of your back, where a day at the computer tends to make itself felt. Then you put a film on and forget the belt is there. That's an ordinary evening with the ULTRA Liberty Belt.

What it is

The ULTRA Liberty Belt holds a large Ultra disk in one place on your body, on your back or your stomach. It works a bit like a bum bag, except that instead of a pocket for keys it carries a tachyonised disk. You wrap the belt round you, fasten it and move the disk to where you want it.

At Tachyon, Ultra disks are the stronger version of the silica disks. If you already know one, such as the 7.5 cm silica disk, the belt is a way to wear a disk all day without it slipping out of a pocket or moving about.

Alongside the standard version there's the ULTRA Liberty Belt X with two disks, which Tachyon calls Extra Strength. If the belt wears out over time, the manufacturer also sells a replacement Liberty Belt without disks, so you can move your disk across.

What Tachyon says

Tachyon describes the belt in its product listing on the Planet Tachyon shop as a belt for the back, made for people who want a disk right where they feel they need it after a long day of sitting or work. The manufacturer also features it on the shop's home page.

All of Tachyon's descriptions start from its process of tachyonisation. If you'd like to know what the manufacturer means by it, we explain it in plain words in What is a tachyon.

How people use it

Most people wear it under their clothes during the day, especially on days spent sitting. They slide the disk to the lower back and fasten the belt so it holds without pressing.

In the evening many put it on for the sofa or an armchair while they relax. Others turn the disk to the front and wear it on the stomach, for instance while reading. It's handy when travelling too, on a long drive or a train journey, since nobody can see it under a jacket.

People who garden or do other jobs bent over often wear it then as well. In that case it's worth fastening the belt a little tighter so the disk doesn't slide as you move.

Who it suits

The Liberty Belt suits people who spend much of the day sitting and want a disk on their back without holding it or sticking it on. It's also useful if you already use Ultra disks at home and want one with you at work.

If you'd like the stronger version with two disks, go for the X. Other belts and scarves are in the Belts and scarves category. If you're putting together a set for home and work, try the kit builder, and if you're not sure where to start, the quiz can help. For an evening rest lying down, there's also the Ultra Cocoon.

Care

Take the disk out before cleaning, and look after the belt according to the manufacturer's care label. The disk only needs a wipe with a damp cloth and time to dry in the air. When you're not wearing the belt, roll it up and keep it somewhere dry so the disk doesn't rub against other things. There's more about disks in Caring for silica disks.

Price and coupon

The ULTRA Liberty Belt costs $265.41 in the Planet Tachyon shop (price checked 28 October 2026). The X version with two disks costs $410.19 and the replacement belt without disks $62.29. Prices are in US dollars and include Dutch VAT.

The code SOKOL takes 10% off. Enter it in the basket before you pay; one coupon applies per order. The SOKOL coupon page explains how it works, and shipping to the EU and UK covers delivery from the Dutch warehouse.