Spring King is MattressNextDay's own house brand, handcrafted in the UK by a National Bed Federation-approved manufacturer and sold exclusively through the MattressNextDay website. I've tested a number of the range across seasons, and what sets it apart from the generic budget mattresses you see at similar prices is the construction quality. Proper pocket sprung cores with real natural fillings on the models that claim them, proper support where the spring count warrants it, and orthopaedic builds that feel structured rather than just stiff.
The range is broad enough to cover most buyer profiles. Entry-level 1000-pocket models at one end, the 3000-spring Supreme Gel Hybrid at the other, and a stack of mid-range pocket sprung and natural fibre options between them. Where it struggles is brand recognition. Spring King doesn't have the marketing budget of Silentnight or the editorial coverage of Simba, and the MattressNextDay exclusivity means you can't cross-shop it at Dreams or Bensons. You either buy it through MattressNextDay or you don't buy it at all.
Who Makes Spring King
Spring King mattresses are produced by a UK-based, NBF-approved manufacturer with over 90 years of combined team experience in the bed industry. The handcrafted-in-the-UK claim is accurate on the models I've checked, which separates it from budget brands at similar prices that import pre-built mattresses. MattressNextDay commissions the range to its own specifications, so the construction and comfort layers are designed for their customer base rather than being off-the-shelf stock rebadged with a label.
The Spring King Range
The Sanctuary Spa 2000 Pillow Top is the model most buyers encounter first and the one Which? has reviewed independently. 2000 pocket springs with memory foam comfort layers under a pillow top finish. Medium-firm feel with good pressure relief at the shoulder and hip from the pillow top. For couples and back sleepers of average weight, the Sanctuary Spa is the default starting point.
If natural fillings matter more to you than foam, the Pocket Tuscany 2000 Natural takes the same 2000 pocket spring base and tops it with natural fillings. Wool, cashmere and silk in the comfort layers give it a different feel from the foam models - bouncier, more breathable, and cooler through the night. Edge support on the Tuscany is softer than on some rivals. I noticed the edges give a bit more than I'd like when sitting on the side, and online reviews confirm that perimeter dip.
Firmness is the whole point of the Grand Ortho 2000, aimed squarely at orthopaedic support for heavier back sleepers and stomach sleepers who need the mattress to hold their hips level. 2000 pocket springs with a firmer spring tension and a thinner comfort layer than the Sanctuary Spa.
Hot sleepers get their own option in the Supreme 3000 Gel Hybrid. 3000 pocket springs underneath, gel-infused foam on top for cooling. The gel layer adds responsiveness that standard memory foam doesn't match, and the spring count is the highest in the catalogue. For buyers who want proper spring support without the heat retention of a foam-heavy build, this is the model.
At the mid-tier, the Pocket Backcare 1500 pairs 1500 pocket springs with a back-support focus for buyers who want proper pocket spring construction without the Tuscany or Sanctuary Spa price. The Madrid 1000 Pocket is the entry pocket sprung option, and the Premier sits at the budget end of the range.
How the Range Feels
The overall lean across the Spring King range is medium-firm to firm. The orthopaedic emphasis means most models feel supportive and structured. Back sleepers and stomach sleepers do well because the spring bases hold the spine level without letting the hips drop. Lighter side sleepers? Not so much. Most of the range is too firm at the shoulder unless you go for the pillow-top models (Sanctuary Spa, Wool Sublime) where the extra surface layer cushions the contact points.
Natural fibre models (Tuscany 2000, Wool Sublime 2000) feel different from the foam-topped alternatives. The wool and cashmere fillings give a bouncier, more responsive surface that doesn't hold heat the way memory foam does. If you've tried foam mattresses and found them too warm or too slow to respond when you change position, the natural fibre Spring Kings are worth a look.
Where to Buy and What to Know
Spring King is exclusive to MattressNextDay. Free next day delivery on most models, which is one of the practical advantages of buying through a logistics-focused retailer. The trade-off is that you can't try a Spring King in a showroom because MattressNextDay is online-only. You're buying on spec and relying on the return policy if the feel is wrong.
Pricing sits in the mid-market. The entry models start around the same level as budget brands, and the 2000-3000 spring models step into the territory where heritage mid-tier brands like Sleepeezee and mid-range Silentnight compete. The MattressNextDay exclusive pricing means you can't cross-shop the same mattress at another retailer, so comparing on construction and spring count against other brands at similar prices is the way to judge value.
Who Should Look at Spring King
Back sleepers and stomach sleepers who want firm structural support without spending heritage brand money. The orthopaedic emphasis across the range suits this group better than any other buyer profile.
Buyers who want proper UK-handcrafted pocket spring construction at a mid-market price. The NBF-approved manufacturing and natural fibre fillings on the upper models put Spring King in a different bracket from imported budget mattresses, even though the price overlap is close.
Hot sleepers choosing between the Tuscany 2000 Natural for natural fibre breathability and the Supreme 3000 Gel Hybrid for gel-infused cooling. Both handle temperature better than standard memory foam.
Who Probably Shouldn't
Lighter side sleepers who need proper cushioning at the shoulder and hip. The orthopaedic lean means most Spring King models are firmer than this group wants, and the pillow-top options only partially solve the pressure problem.
Buyers who want to try before they buy. MattressNextDay is online-only, and the brand has no showroom presence. If lying on the mattress before committing matters to you, a Dreams or Bensons brand serves better.
Anyone who wants maximum trial length. MattressNextDay's trial terms are shorter than the 200-365 night windows Simba, Emma and Nectar offer. Check the specific return policy before ordering.
Verdict
Spring King is MattressNextDay's strongest exclusive and a legitimate mid-market pocket spring brand. The Sanctuary Spa 2000 and Tuscany 2000 Natural are the two models to start with. The Grand Ortho 2000 is the one for serious back support. The range leans firm, the construction is honest, and the UK manufacturing separates it from the budget imports it shares shelf space with.
