Icebreaker Sphere

What material is best?

Wool is moisture-wicking and odor-resistant, while synthetic fabrics are more durable and less expensive.

Match the temp to the trek

Lightweight layers are best for moderate to cool temperatures. Midweight layers are best for cold temperatures. Heavyweight layers are best for below-freezing temperatures.

Find your fit

To be able to wick sweat efficiently, your next-to-skin layer needs to actually be next to your skin. A comfortably snug fit everywhere is your goal.

Bra support

• Low-impact: Best for A/B cups and activities like walking, yoga and strength training
• Medium-impact: Ideal for activities like moderate hiking, skiing, road cycling.
• High-impact: Best for D cup or larger and high-impact activities like running, mountain biking and high-intensity workouts.

Support style

• Compression: Pull-over style compresses breasts against the chest; no built-in cups
• Encapsulation bras: Built-in cups support each breasts separately with minimal compression
• Compression/encapsulation: Combines cups and compression for support and natural shaping

Strap type

• Crisscross: Crosses in the back; often found on low- or medium-support bras
• Tank top: Similar to everyday bras, often with adjustable straps
• Racerback: Straps form a Y shape between shoulder blades for medium- to high-impact activities; may put pressure near neck
• Combination: Adjustable straps convert between styles