Sometimes waterproofs aren't actually waterproof... If you're out on site or dashing to a meeting in the rain, you need to actually keep dry! But do you know what to look for in a waterproof jacket?
How waterproof a coat is will depend on its waterproof rating. The higher a coat's waterproof rating, the longer the fabric will remain waterproof for.
0 - 1,500mm Water resistant/Snowproof
This bracket includes lightweight windbreakers such as the TS010 or TS011 (below), and even many softshell jackets are water resistant - they will protect you in brief showers.
TS010 Lightweight Jacket - https://www.giraffe-graphics.co.uk/lightweight-jacket/
TS011 Contrast Lightweight Jacket - https://www.giraffe-graphics.co.uk/contrast-lightweight-jacket/
R121A Classic Softshell Jacket - https://www.giraffe-graphics.co.uk/classic-softshell-jacket/
1,500mm - 5,000mm Waterproof
Usually for a coat to fall into this bracket, it will also have taped seams - to ensure water doesn't seep through where the fabric is stitched together. This is the point from which coats are actually defined as being waterproof.
R221M Core Channel Jacket - https://www.giraffe-graphics.co.uk/core-channel-jacket/
5,000mm Very waterproof
Coats with this waterproof rating are designed to withstand moderate to heavy rain for more extended periods of time, and will often feature multiple layers with a fleece or softshell inner to keep the wearer warm, such as the RG085 (below).
RG085 Defender III 3-in-1 Jacket - https://www.giraffe-graphics.co.uk/defender-iii-3-in-1-jacket/
RG060 Classic Insulated Jacket - https://www.giraffe-graphics.co.uk/classic-insulated-jacket/
10,000mm Highly waterproof
Coats with a 10,000mm+ hydrostatic head are serious waterproofs. Designed to withstand heavy rain with fully taped seams, and again, usually multiple layers.
RG191 Kingsley 3-in-1 Jacket - https://www.giraffe-graphics.co.uk/kingsley-3-in-1-jacket/