There have also been inquiries from people going to Antarctica. Their footwear is stocked in 75 stores nationwide including Hunting and Fishing New Zealand and Palmers Garden Group, and they are in talks with RD1 and Farmlands.
The Sheaffs owned local retail store Hula for 10 years, but sold it 18 months ago as the wholesale side of Boonies rocketed.
"We were getting busier and busier and Glen needed support so it was a no brainer," Mrs Sheaff said.
The agriculture field days circuit kicks off this month in Northland and the duo credit part of their success to meeting customers face to face at events.
"Being able to respond to what the market needs quickly is a huge advantage for us. We get feedback from the field days and act on that."
Another Tauranga company that values field days and expos is Kliptank Ltd - it has increased its business by 300 per cent year on year since starting three years ago.
It manufactures above ground bulk storage facilities for water and dairy farm effluent - a system invented by its director Neil Peterken.
North Island sales manager David Parker said growth has been huge and they moved to a purpose-built 3000 square metre complex at Tauriko.
"Business is wonderful and we are really starting to get traction now."
It employs 10 staff and makes about 50 tanks per year.
Field days and expos were vital to showcase new products and generate awareness, he said.
"The Northland Field Days is a great focal point for the north and we need to be there."
Northland Field Days president Lew Duggan said Bay of Plenty exhibitors were extremely important.
"This is Northland's largest ag event and provides opportunity for the public to find out about wider opportunities with national businesses offerings.
"They added variety, choice and technical expertise."
The number of Australian companies represented had doubled this year with 50 new exhibitors registered and crowds exceeded 25,000 in 2013, he said.