The pouches are ok, but check they work regularly because after a while they fail to stop the signal as the lining wears.Last year I provided the Police with two CCTV videos for attempts on my neighbours cars.
They advised me to buy two items that should stop potential thieves dead.
With the Krooklok they would just go and try elsewhere which they did in the next street.
Anti Theft Car Key Pouch Twinpack
Protect your vehicle with the Anti Theft Car Key Pouch Twinpack. These pouches create a shield around your car keys, blocking the signals that enable keyless theft.<crlf> <ul><crlf> <li>Block wireless signals emitted from your car keys</li> <crlf> <li>Blocked signals include SMS, Wi-Fi, 2G...www.aldi.co.uk
I keep my unused spare in a faraday pouch and my regular key in a small box.
And use a steering wheel lock as an extra small deterrent.