The offer document highlighted Briscoe Group's lack of debt and cash reserves as well as its share trading in comparison with Kathmandu.
Since November 2009, Kathmandu's shareholder return has decreased by 19 per cent with Briscoe Group shareholder return rising by 234 per cent overall.
NZX50's Gross Index rose by 81 per cent over the same period.
Briscoe Group managing director and majority shareholder Rod Duke said:
"By offering a combination of shares and cash, we are providing Kathmandu shareholders with the opportunity to share in the benefits we expect will be generated from combining the two retail businesses and forming a significantly larger Trans-Tasman retail group."
The document also highlighted sales volatility as a push for Kathmandu shareholders to accept the offer, with complementary peak sale periods for the two businesses - Briscoe Group's leading up to Christmas and Kathmandu's in Easter and into winter.
"Both businesses therefore complement each other. Combining them would result in lower volatility in operating earnings," it said.
Briscoe Group said the combined group would have annual sales in excess of $900 million based on historical trading and a market capitalisation of some $900 million.
If the offer was successful, Briscoe Group said it intended to seek a listing on the ASX alongside its NZX listing. Kathmandu has said it would update the market at the appropriate time but within two weeks.
Briscoe Group shares opened at $2.80 this morning with Kathmandu shares opening at $1.75.