Firstar developed BIO-SENSE FIT™ technology to give our MST™ Fabrics the ability to contour and form itself to all your body's curves allowing the material to be as close to your skin as possible without being restrictive. MST™ is a 4-way stretch material that senses your body contour and adjusts itself to conform to your individual body type, creating the highest level of performance, fit and comfort.

Compression Fit is a tight fit, muscle compression wear, the ultimate MST™ line in lactic-reducing performance wear for multi-discipline performance activities.

Contour Fit is a close to the body non-compression wear that features MST™ four-way stretch for total multi-sport performance, mobility and recovery, wash-after-wash.

Loose Fit is a relaxed fitting garment with MST™ technology to deliver the ultimate in heat, moisture and odor dissipating performance wear, an all-round performance and comfort upgrade to traditional cotton sportswear.

	Compression Fit is a tight fit, muscle compression wear, the ultimate MST™ line in lactic-reducing performance wear for multi-discipline performance activities.
	Contour Fit is a close to the body non-compression wear that features MST™ four-way stretch for total multi-sport performance, mobility and recovery, wash-after-wash.
	Loose Fit is a relaxed fitting garment with MST™ technology to deliver the ultimate in heat, moisture and odor dissipating performance wear, an all-round performance and comfort upgrade to traditional cotton sportswear.