Mac in a Sac Men's Ultralite Trousers – Lightweight Waterproof Trousers for Fast Movement
Move faster, stay drier. The Mac in a Sac Ultralite Trousers are built for trail runners and fast hikers who need reliable protection without the weight. The ultra-light, flexible Vaporlite fabric (90% Polyester / 10% Spandex) delivers superb freedom of movement, while a 2.5-layer waterproof construction with fully taped seams keeps the weather out. At just 195 g (Men’s M), these pack small and perform big.
Size & Fit
- Close fitting athletic cut designed for fast movement
- Elasticated waist for secure comfort
- Articulated knees improve mobility for running, scrambling and steep climbs
Key Features
- 2.5-Layer Construction – lightweight, protective and packable
- Highly Waterproof: 8,000 mm hydrostatic head
- Highly Breathable: 16,000 gsm (for active comfort)
- Fully taped seams to seal out rain
- Windproof for exposed ridgelines and coastal runs
- Elasticated waist for a dialled-in fit
- Articulated knee for comfort and performance
- Elasticated loop for storage – packs down neatly
- Cycle straps and reflective detailing for low-light visibility
- Weight: Men’s Size Medium approx. 195 g
Perfect For
- Trail running and fast hiking
- Hillwalking and mixed-weather training
- Cycling commutes and travel
- Unreliable Irish weather across Donegal & the Wild Atlantic Way
Why Choose Ultralite?
Performance without compromise: serious waterproof protection, high breathability, and stretch comfort in a featherweight package that disappears into your pack when the sun breaks through.
FAQs
Are they fully waterproof?
Yes. They use a 2.5-layer fabric with 8,000 mm waterproof rating and fully taped seams to keep out rain.
Will they breathe during hard efforts?
With a rating of 16,000 gsm, they’re designed for high-output activities like trail running and fast hiking.
How small do they pack?
Very small — the elasticated storage loop helps compress them for drop-in carry.
Care tips?
Close fastenings, wash cool and gentle. Avoid fabric softeners. Line dry; re-proof DWR as needed to maintain beading.
Shipping & Returns
Fast Delivery from Borderland Muff, Co. Donegal.
Nationwide tracked shipping across Ireland, plus Click & Collect in-store.
Easy Returns: If the size/fit isn’t right, return unworn for an exchange or refund.
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