Skullcandy, which sells fashion-forward headphones and related accessories in 70 countries, raised the proposed deal size for its upcoming IPO on Monday. The Park City, UT-based company now plans to raise $153 million by offering 8.5 million (51% insider) at a price range of $17 to $19. The company had previously filed to offer 8.3 million at the same range. The increase in shares to be sold is entirely attributed to existing shareholders. Skullcandy, which was founded in 2003 and booked $175 million in sales for the 12 months ended March 31, 2011, plans to list on the NASDAQ under the symbol SKUL. BofA Merrill Lynch and Morgan Stanley are the lead underwriters on the deal, which is expected to price this week.