The Arcteryx Phase SL Boxers are light and comfortable underwear that are ideally suited for intense activities. They are constructed from Phasic SL fabric, which is the lightest of the Phasic fabrics. This ensures absolute optimal wicking properties and is ideal for high aerobic stop-start activities. Manufactured using flatlock seams and a soft waistband, so you are ensured comfort with no chafing.
Phasic base layer fabric is compiled from two different yarns. The first is a non absorbent hydrophobic yarn, which will shed water molecules pushing them onto the PHi yarn. Silver ions are encapsulated into the hydrophobic fibres of the yarn, which provide anti-microbial properties to help eliminate odour.
The second yarn is PHi, a multi dimensional yarn which wicks moisture laterally along the length of the yarn, effectively dispersing moisture evenly across the garment. Temperature regulation is improved as this dispersal eliminates cold spots. As you slow down or stop the fabric will dry quickly, as a result of the larger surface area the moisture is covering. This quick evaporation helps to retain body heat.
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I am a big fan of the fabric used in these boxers and have quite a few base layers of the same fabric. It is really leightweight has a silky feeling, retains its stretch, does not retain odours. Overall a great baselayer.
I have bought a pair of these in size XL when they were on sale. I would say they run a little bit large, but nothing to worry about. The pair I got had a small hole just below the waist band, looks like a damage from pulling it too hard, that's why I give it only 4 stars. Otherwise the material is breathing well and soft, making for a comfortable pair of boxers.
I bought these to wear under a compression layer when skiing, as I wanted something lightweight and breathable, and most importantly wrinkle free. I have a 32" waist and have tried the Small and Medium sizes. The Small size provides the best wrinkle free fit, but the Medium is not excessively baggy either. They do not stretch excessively during the day, wash easily and dry fast, which is just what I was looking for. As commented the packaging is excessive for sports underwear, maybe Arcteryx are trying to justify the relatively high price. Recommended.
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