What difference do the 'modified raglan' and 'gusset' mentioned in the windbreaker description make when moving?
After seeing unfamiliar terms like modified raglan and gusset in the windbreaker's detailed description, you may want to check what practical function these details serve during actual activities.
It avoids the foreign body sensation of shoulder seams rubbing against the skin and adds three-dimensional panels under the arms, reducing friction and catching when moving while swinging your arms wide.
When moving quickly while wearing clothing, the first places friction occurs are the shoulder lines and underarm seam areas. Typically, raglan sleeves refer to a form where the seam line slopes down from the neckline toward the armpit. SAN SAN GEAR's BREEZE WIND BREAKER features modified raglan sleeves that redirect the seam path to reduce the foreign sensation left by shoulder seams touching the skin[1].
A gusset, a three-dimensional pattern that provides extra room, was added to the inside of the underarm[2]. A gusset is a construction method that widens the range of motion by piecing together polygonal fabric in areas where seams easily overlap and become stiff. By shifting the shoulder seams away and securing room to move under the arms, the sleeves do not chafe the skin or cause the hem to ride up even when running while swinging the arms widely back and forth.

Whether a separate mesh material is lined in the gusset area has not yet been confirmed.
