Its simple if you want your Irish Terrier coat in a good shape they have to be handstripped 3/4 times a year.

On the moment its trendy to groom/clipping them but this will kill
the beautifull red hairs and leave the coat soft and colourless.

So why do they clipp them ? because its much faster and easier
a proper handstripping takes about 5 - 8 hours of hard work and
a clipping is done in 2 hours.