Mac in a Sac Men's Ultralite Trousers | Lightweight Waterproof Trail Running Trousers Ireland

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.